SCREAM...pass out....SCREAM...pass out....lol.
I really loved the kid that would pass out and then scream some more. Crazy stuff! This happens when your body hits a certain amount of G's; depending on the direction it hits you (face, legs, spine, etc.) different people can handle different amounts of force before they pass out. Basically, the lack of gravity temporarily causes your brain to be lacking oxygen, and you go nighty night. But don't worry, if you're a roller coaster enthusiast, you will have built up a tolerance to this!