What is the worst bad beat you ever took?

All of them are bad. Obviously one outers and hands where villain hits running cards on the turn and river are the worst.

AA vs 66 preflop all in, board comes 54322. It probably wasn't worst, but one to remember.
Next would be nut flush vs rivered straight flush.
And then 55 vs TT on 356 rainbow, turn comes 6 for Full house, and then board beats me with 6 on river.

I had 6♦:7♦: hole cards.
By the turn was 8♦:9♦:T♦:<rag>
River was Q♦:

Villain held J♦:

<sigh>

But then, I hit a few one-outers myself, so I'm not sure where the balance lies...
VS

I have flopped the virtual nuts with just 2 outs left for the villain to hit runner runner and he gets there. Just 2 cards left in the deck to hit, one card on turn and another on river. It's happened a few times. Roughly 1,250-1 suckout.

I think like quads vs quads. I had I think 22 and villain had 99. Flop came 229 turn 9 river x.

wasn't really a beat but a bad mistake when I first started playing Omaha. would have been about a 3000 dollar pot and I folded my hand on the river with the nuts and realised after I had mucked them. That would have a very large pot for me and it was live as well. I fully understand the wrap now.

guess my worst bee at online texas was my qq against a2 off suit, flop was qkk then kk and checked the flop, all in at turn and called very painful k on the river

actually in Omaha my kk against 10,10. obviously my fullhouse of kings beaten by a poker of 10's and that's the second biggest pot I've lost around 2000 dollars