The joys of living in a third world country...last year, for our haunted house/laboratory one of our local employees came up with a pig's head. To keep it fresh until the carnival they put it in the fridge in the teacher's lounge. I added a sign, this is what happened to the last person who refused to volunteer for a booth! Poor pig!

The husband of our guidance counselor agreed to help in our haunted house. She was the tour guide, he wore a glowing mask and stood behind a wall of other glowing masks. You couldn't tell there was anyone in there. When a couple of teachers came through, the counselor let it be known that there was indeed some teachers coming through and of course everyone working in there was primed and ready. The husband almost got a bloody nose one of the teachers hit him so hard when he jumped out at her. I know this isn't exactly the criteria you ask for but you could change it around a little.

LOOKING FOR CARNIVAL ANECDOTES!
I am a children's novelist, and unfortunately, during this year's fall carnival, I had to be out of town on business. Missed the entire affair.
However, I am incorporating a humorous scene of a school carnival involving boys, aged 7-17, into my novel.
Any sublimely ridiculous, hilarious, hysterical school carnival incidents you can recount that you'd like to share?
I would be so extremely grateful to hear your stories! Anything and everything!