Two or more players take turns setting a quarter into spin on a flat surface (usually a table). An opponent attempts to stop the coin on its edge in an upright position with
one finger. Pretty tricky. Success = escape from
extreme pain. If you can't prevent the coin from falling flat on the table you have to stand,
make a fist, and place your knuckles flat on the table such that they face your opponent. He (or she?) uses a thumb (and probably a terrible amount of force) to slide the quarter at your knuckles, keeping the coin flat on the table surface. A good player will never miss and have you bleeding in the first round.
*this is only a drinking game insofar as no one in his right mind would dream of playing unless grossly intoxicated.
(don't worry, you can tell people you busted your hands kicking someone's ass)