I've had so many bad runner-runner or one or two outers on the river happen to me online that I cannot remember the worst..same thing in 1/2 limit where a chaser lucks out on the river and hits a straight or flush against my set, so I'll give you a recent live bad beat.

Not long ago I was playing in a live single table tournament with 4 people left and money paid to the top 2. I was in 3rd place and the short stack barely had enough for another BB. I am in the BB and get dealt AK. UTG limps, chip leader folds, short stack in SB folds. Action comes to me--since UTG had played aggressively earlier and limped, I put him on an Ace/something so I try to get him to fold by going all in (he barely had me covered). He calls and flips over a pair of nines..uh oh. Flop is K x x (whew..I'm in the lead), turn is a blank..I'm now a 95% favorite to win the hand..river is you guessed it a...9. I was gracious in defeat and he felt bad for sucking out on the river, even though it was I who sucked into sucking out on the flop.