You pick up the donkey costume that you noticed on the rack. It is a single piece. There is a zipper along it's back that allows you to climb right in. You do so, placing each arm and each leg in it's appropriate place, then heave the rest of the costume up over your shoulders, and wiggle about a bit to make the rest of it cover your behind.
The head of the piece dangles in front of you. You grip it as best you could with your gloved hands, and heave it up over your head. With the costume's head over yours, you notice a mouth piece poking into your face inside of the costume. You grab your mouth over top of it, and it seems to grow larger as you do. It seems to slide down your throat, extending all the way down. You start choking and struggle to breath. As you do, you black out.