Funny my having been a preschool teacher is coming up in two topics:
I had one child who was that typical "put things in every orifice on your face" kids (3 or 4 years old). I was subbing in his class, and found out about his behavior... so I (thought) I move anything he could get ahold of away from him before nap time. The kid some how found a crayon, broke it, and shoved it all the way up his nose. Then he panicked and tried to get it out, and shoved it further up his nose. I heard him start to cry and go over, there was actually a bulge in his nose where the crayon was.
At the time, it wasn't funny at all, but looking back, it was pretty hilarious.