In eighth grade we had these things called "mock congressional hearings". We were put into groups of three and given a famous supreme court case to present before a panal of three parents and our teacher. It was a big deal, we all had to where suits, the girls dresses, and it was a large part of our grade.
The class was setup where the three of us were at a desk at the front of the class facing everyone. The parents and teacher were in the front row, all the students behind. Making the students not seen by the teachers or parents.
The three of us in my group were all good friends of one impulsive kind of crazy kid who happened to be in our class. Anyways, half way through our presentation he stood up on a desk, lifted up his shirt and began rubbing his nipples. The kid next to me was trying really hard to hold back his laughter, so our friend sat down. Only to stand up again accept with a large veiny dick drawn on his stomach, pretending to jerk it off.
The teacher turned around quickly just as he was sitting down and told him to stop whatever he was doing. Fun times.