Please don’t.

One of the things you learn pretty quickly in an ambulance is how easy it really is to stay calm around sickness and gore. You’re worried about how you’ll react, and then when you first see a really mangled limb, you think: “Hmm. So that’s a mangled limb,” and then get on with the job. Things you thought would be frightening are more interesting when they actually happen. But you want to know how to thoroughly scare a couple of paramedics? Tell them you need to go to the bathroom, and can’t hold it til the hospital.