The worst beat I have ever seen (during 2004 WSOP)...

[Talking Poker]

This hand wasn't filmed, but here's what happened...

I don't know the exact sequence of betting, but it doesn't really matter. What matters is the flop was 557 and the guy with Pocket 9s pushed all in. The guy with Pocket 5s immediately called with his quads.

Turn - 9.
River - 9.

The guy caught two perfect running cards. What are the odds of that happening? with 45 unknown cards left and exactly 2 that could allow the Pocket 9s guy to win....

43/2 * 43/1 = 925:1.

Ouch.