Author's Note

These are semi canonical additions written by commenters which I enjoyed quite a bit. Reposted here with permission.

There might be another chapter in the future as well, so if you havent added this story to tracking then I'd encourage you to do so.

Addendum 1

General Info (added by SCPPinkamena)

SCP-62162
Object Class: Keter

Description:
SCP-62162 is mammalian entity in the shape of Equus Ferus Caballus, more commonly known as a pony. Attempts to capture the object have all but failed as of ________ and the entity is still at large. SCP-62162 fur color ranges from a dull muted pink, to a pasty bubbled gum pink, and it’s mane will also follow suit, being a darker shade of pink. Object wears a papier mache mask consisting of a simplistic design of a smiling face with blue and yellow alternating color. Object has shown minor moderately high reality warping capabilities, to the point of moving up to fifteen (15) persons. It can measure from 13cm to 5m in height depending on the situation it was called to and has shown inequine flexibility, such as the act of clapping and bending over backwards to preform backflips and cartwheels. SCP-62162 manifests itself when a child, typically under the age of 15, is found to being abused or neglected on the child’s birthday. In which case a “Party Animal” event will occur. Stage one is that the entity will observe for no where upwards of two (2) hours. In this time frame, it is believed to gather information about the child, such as friends and acquaintances, be they family friends or something related. Stage two is when the child and their friends/acquaintances meet in either the dinning room, living room, or a room big enough to contain all participants. At this point, the child now becomes SCP-62162-b, now having fully participated either part games or opened presents, most of the times both. Stage 3 is when someone mentions a cake, in which case a cake as large as the doorway itself with be wheeled in on a snack cart by SCP-62162-a itself. The “Party Animal” event is over when the child makes a wish and blows out the candles, after which, no trace of the child, the guests, or even a party will be found. The parents, or acting guardians, will almost always be in a semi-conscious state while being _________. In all cases, the parents or guardians are still alive in this state. On site personal are advised to terminate anyone found in this state.

Secure Containment Procedures:
As of today, SCP-62162 has evaded capture. In all known instances of a “Party Animal” Event, all planted agents have been either found mangled, stuffed, inflated with helium, strung up and beat, or in rare cases, found torn open, with small gifts and knick knacks found inside of them. The O-5 council has agreed that such an entity cannot be allowed to roam the world freely and has thus formed a team called Alpha 34, the “Party Crashers” to try an eliminate the entity, if at all possible.

ADDENDUM (added by Powerdrain)

As of September 26, 20xx a previously unknown behavioral pattern of SCP-62162-a has been discovered.

Agent Name Here, embedded in Hospital Name Here hospital, the Netherlands had a chance encounter with SCP-62162-a.

Agent Name Here, who was assigned to the quarantine wing on an unrelated SCP case, reported the sudden appearance of loud, out of place noise; music, singing, cheering, laughing, etc.

When agent Name Here moved to investigate, he discovered no other personnel could be found, despite round the clock care required at his post. Attempts to contact security also failed.

Further investigation by agent Name Here revealed the sounds heard came from within one of the sealed units currently occupied by a young boy by the name [REDACTED INFO], age seven, now referred to as SCP-62162-b.

SCP-62162-b was admitted to the hospital, and subsequently quarantined for Name Long Medical Here, two months prior. During this time, his condition gradually worsened, with prognosis for full recovery below ten percent.

SCP-62162-b had been bed ridden and near immobile for the better part of two weeks prior to the incident, requiring a respirator and had been unable to see either his family, or friends directly for most of his stay in the hospital.

As a later investigation uncovered, SCP-62162-b's birthday coincided with the day agent Name Here encountered SCP-62162-a.

Unable to find any personnel present, agent Name Here, after equipping the required protective environmental suit and following the mandatory decontamination procedure, entered the sealed unit to determine the source of the sounds.

What agent Name Here encountered was, in his words: "Strangely familiar."

The room, normally kept clean, with only the required medical equipment and patient's bed, was fully decorated with balloons, streamers and confetti.

All available cabinets and shelves were filled with various snacks, chips, pizza, cupcakes, etc. With an assortment of soft drinks available as well, replacing any and all medicine and medical instruments normally found there, while the target's respirator was replaced by a portable stereo from which the music was playing.

SCP-62162-b, bedridden and near immobile prior to SCP-62162-a, was found sitting on his bed, showing no signs of illness; laughing and eating a slice of pizza while watching a cartoon on a brand new, 4K television of unknown make and model hanging from a wall. The show depicting various equins of similar nature to SCP-62162-a.

Investigations into this cartoon have yielded no results, as no known media outlet claims ownership to this "pony show".

Found in the room with SCP-62162-b was SCP-62162-a who, until agent Name Here entered, sat beside the bed to keep SCP-62162-b company.

When agent Name Here stepped inside, however, something unusual happened.

Whereas previous encounters with SCP-62162-a between field agents trying to interrupt an event, or capture the anomaly have ended with injuries or death, agent Name Here's encounter with SCP-62162 was completely peaceful.

Agent Name Here stated that: "When I entered that room and saw SCP-62162, I wasn't scared. I wasn't confused, weirded out, or anything like it. When I saw it… her… I knew her. I've seen her before. When I was a kid."

It should be noted that agent Name Here was admitted to Pinkie Pie Can see You hospital at age nine for And She Is Coming For You!. During this time he was unable to see either his parents or friends, while his condition worsened.

Medical records indicated that, despite best efforts, he would not survive bar some miracle.

Agent Name Here continued to state: "I was, what? Nine, I think. Sick like nothing else I have ever had. Lying in some twilight state between life and death, not knowing up from down. But then, somehow, life returned to me, and I can see this weird, pink horse thing wearing a mask look down at me. And even with her face covered, I knew she was smiling. And when I sat up, not sure whether I should scream or hide, she gave me a cupcake…

I honestly thought I made the whole thing up, growing up. Some delusional fantasy of a sick kid who somehow managed to beat the odds. But when I entered that room, I knew her. And I know she knew me. Because the first thing she did when I locked eyes with her was smile behind that mask and give me a cupcake. After that… I found myself sitting behind my desk. I would have thought I had dreamt the whole thing if it wasn't for that same cupcake standing before me, along with a hand made card."

Both the cupcake and card were taken for study by foundation agents after agent Name Here reported his encounter with SCP-62162-a.

The cupcake was later determined to be just that, with no anomalous properties to be found.

The card, made of several different colors of paper, held the following message:

Glad to see you're well, but this party is not for you.

As of this incident, additional agents have been placed within hospitals around the world in case of future SCP-62162 events.

Additionally, after agents Name Here encounter with SCP-62162-a as a terminally ill child, and him encountering SCP-62162-a in the presence of a terminally ill child on both their birthdays had Foundation scientists examine all stored medical records detailing terminal ill children, after which a pattern was found. The fact he was the only one still present, whereas all other personnel had mysteriously vanished, is still being investigated. But his connection to SCP-62162-a as a child undoubtedly plays a major role in this.

It would seem that, beside SCP-62162-a's observed behavior when dealing with neglected and/or abused children who miss their birthday, SCP-62162-a also seeks out any and all children too sick to celebrate their birthday with family and friends.

But where a "Party Animal" event would result in the servere maiming and potential death of one or both parents and/or legal guardians, as well as the disappearance of SCP-62162-b after the "Party Animal" event comes to an end, during one of these hospital visits SCP-62162-b does not vanish once SCP-62162-a leaves, while SCP-62162's family is left alone.

ADDENDUM

After further investigation into the nature of SCP-62162-a's hospital visits, now referred to as a "Clini Clown" event, Foundation researchers have found no less than 631 confirmed SCP-62162 events in hospitals around the world in the last decade, but with signs indicating "Clini Clown" events have happened for at least a century, probably more. With the total of "visited" children numbering in the tens of thousands.

Additionally, 93% of these SCP-62162-b instances were diagnosed with incurable diseases, and were either unresponsive or comatose during a "Clini Clown" event.

After these events, 83,7% of these SCP-62162-b instances would miraculously recover, while the remaining 16,3% have been reported to die peacefully while smiling.

In all cases where a SCP-62162-b instance passed away, a cupcake of their favorite taste can be found on their grave no less than an hour after their funeral.

How SCP-62162-a knows when a SCP-62162-b instance has expired is as of yet unknown.