Pinkamena pulls a number and brings a stallion over to make cupcakes, but she gets more than she bargained for.
This story contains the version of Pinkie from "Cupcakes" but the events of "Cupcakes" aren't canon to this story for 2 reasons.
1. She actually cares for her friends and doesn't want them having numbers in there.
2. She isn't dumb enough to kill them. She knows fully well that if some evil threatens Equestria, all of her friends need to be alive in order to use the elements and fight the evil.