A woman must pipe in this one now.
Ok, this one is a bit disgusting, but what the hell...
I was in high school at the time wearing a pair of Khakis. After I was done eating lunch, I got up to take my tray to the garbage area, and I begin to feel rather wet. Immediately, I go to the bathroom, and there's this big mirror right as you enter. I see a huge pool of red on the backside of my Khakis. Just half the day was gone, which meant that I'd have to go to the gym to change into my gym shorts for the rest of the day. Problem is, I hadn't shaved for like 3 days, so my legs didn't look too appealing. I returned to my seat only to notice a small puddle of red, and the hottest guy in the class who sat at the table next to us looking at me started teasing me, and I would never live this down for the rest of the school year. He, in fact, wrote something about it in my yearbook that year.
Hey, I told ya it would be a little disgusting!