Scream, faint. Repeat three times.
Part of the fun of watching these "someone freaks out on an amusement park ride" videos is guessing who it's going to be at the beginning of the clip. Through the first fifteen seconds of this one, it looks like it could go either way, because neither kid seems terribly happy to be there. But once the ride takes off, it becomes clear which one of the two is not cut out to handle the Sling Shot. Hell, judging by how much screaming he does in between fainting three separate times, I'm not sure he'd be able to handle a ride in a glass elevator.