Bottle bet makes 'em look goofy AND win you a free drink We've said it before: you just can't know too many ways to win a free drink. This time, the setup is simple: fold a bottlecap in half and place it inside the lip of a bottle set on its side. Tell them all they have to do to win a free drink is blow the bottlecap into the bottle. However, once they start, every puff of air only blows the bottlecap out of the bottle!