It's can't be done" you exclaim. This is sure to get your marks attention. "There is no way it can be done." after saying this a few times the question of what the heck you are talking about is sure to come up. You can't pick up a shot of whiskey without spilling a drop. Your mark is sure to think he can, and the challenge starts. The whiskey is poured, and you go over the rules. You can't spill a drop, I won't push you or anything like that. They will of course say okay. Well why don't you put your money where your mouth is, a bet is made. Who could say no, it sounds so easy.