Yikes! At the risk of embarrassing myself into lurk-dom, I will confess this: I did that once in the 4th grade. Had to handle business in the boys bathroom and like any good hygienist I carefully layered toilet paper on the seat, (although a bio-hazard suit would be more suitable).
Well I got back to class and walked up to the front to the teachers desk to return the hall pass. All the kids were wetting themselves laughing, and what do you know? The aforementioned hygienic precaution came back to bite me in the area they were guarding.

I wanted to jump into a black hole.