Cupcakes - The Movie

Pinkie grabbed a hacksaw. There was a weird circle crack in the roof with tape on it that appeared.

"I wonder if it could go through the bone this time.." Pinkie pondered thoughtfully, looking at Rarity's horn as she attempted to escape.

Pinkie began trying to cut at her horn, but she kept moving.
She cut, but she moved, and there was now a large cut on her head.

"Ugh! Come on Rarity! Gigantic cuts on your head don't look pretty. But earth ponies can though, obviously, like a certain pink pony..." Pinkie said, grinning.

She chopped again, cutting the outer skin layer on Rarity's horn.
She kept hacking, and then began cutting and it began slowly breaking into the horn.

~~A few minutes later!~~

Her horn was cut off, but it wasn't clean. There was blood, it soaked the skin around her horn to a light pink.

"Hey Rarity, your fur is pink like mine! Hehe.. Now we can be sisters!"

Rarity noticed the nail wasn't totally through her hoof, and tried to move her hoof, until she felt a burning pain in her hoof. The nail was in to the bone, and she couldn't move it.

Upstairs, they heard light walking.

"Great! Somepony else to join the party!" Pinkie laughed innocently.