Once in 7th grade I felt under my desk for some reason and felt something wet and slimy. When I brought my hand up it was covered in a MASSIVE lougie that someone had kindly left for me. I walked up to my teacher, waited patiently until he had finished talking to another student and then showed it to him and asked if I could go to the restroom. He looked and my and said yes, while looking rather disgusted. I never got the chance to explain to him that it wasn't mine though, he probably thought I was some nasty kid who sneezed all over himself.
So if you were the kid who left that there and you're reading this now, I haven't given up looking for you. Know that when I find you, and I will find you, I will kill you.