Here's a neat math trick to impress your friends (especially after they've been drinking), inspired by our favorite mathematician Martin Gardner.
The bristly-haired Brian Brushwood of Scam School explains how you can always predict in advance how a game of Tic-Tac-Toe would end.
Link [embedded YouTube] - via Cliff Pickover's Reality Carnival
"OK GUYS, HERE GOES! Each of you, take your first move and I'll tell you how it ends!"
^o^
"It's gonna be a tie!"
-.-