My brother figured a way how to drill people on bumper cars, you like stand up on the gas, bringing your ass off the seat like a foot, pull yourself into the wheel, right before impact, sit down hard, explode with your legs, and chest(like a bench press), explosive movement is the key, you would not believe the difference it makes, we would fucking be wrecking people, more then a few people helped off, other kids crying, on the go kart's on camelot i fucked somebody up so bad, they got taken away by a ambulence, and the pigs held everybody trying get us to admit who did it, my parents always talk about it lol.