You are wise poit, as this poit actually made a bottle "bomb" and blew my hand up. heh, 1998. Lets just say, Chlorine + Flat Coco-cola in a plastic bottle is not a good mix especially if you riding a bike and tring to aim it on top a building, and it explodes in ur hand. and you keep on riding half blind coz ur friends have since rode off. haha.. hmm wasnt too bright of me to do such stupid acts. But then again, my hand is fine and all in all, was fun.