When I was in the sixth grade, I got an involuntary woody during class. I thought it would be okay because it would be a while before the bell would ring, so I could just relax and not worry about having to stand up. Well, as my luck had it, the damn fire alarm goes off and everyone in the class ran out of the room. I just sat there in the class until the drill was over with and everyone returned to the class. My teacher was like "You didn't come outside? What if the building would have really been burning?" I answered her with some stupid shit like "I couldn't make it because my shoe was untied."