I've had it happen a couple of times. Strange shit to see Bro. For me, the second I pulled out the syringe tip... there was this hissing noise as a small jet of blood came out(of my glute). I kinda thought it was neat, sort of like watching your own horror movie. However, a friend of mine had it happen to him, he immediately passed out. He woke up on the floor with his pants pulled down. If he didn't see the syringe lying there beside him... he'd of thought he got ass raped by somone. LOL