Have u ever had experience about that?

When i was at primary or junior high school, i forget,my friend suddenly touched my cock for fun at school bus. Dont know why my cock got really hard. On the way to my home, my cock was getting harder. Thats really really hurt me. When i arrived home, i opened my underwear directly. I was a bit shock at that time, my foreskin was rolled. Thats the first time for me to see my headcock which was still very sensitive. It's really red n throbed. But now thats not a problem anymore(mine's still uncut)

How about u,guys?any cock accident?with d zipper, got punch, kick, pinch or something like that.
What did u feel n do at that time?