Why do people pee when they're frightened?

Have you ever been so frightened or surprised by something that you peed yourself, even just a little? It's ok, you're in the company of friends — nobody is going to make fun of you. After all, it's not like it was your fault; strictly speaking, if you did leak a little bit the last time you were scared, it was… » 10/31/11 11:00am 10/31/11 11:00am