Biggest pot you've ever made a bad fold in?

[UATrewqaz]

I just mucked the best hand in a 14 BB pot, which was pretty gross. Some 51/41 maniac blew me out of the pot (I had top pair, mediocre kicker) It was my first orbit so I didn't know he was a loon until later. I assumed he had an overpair and there was a caller so I figured I couldn't beat him AND a caller.

What's the worst fold you ever made? if you recall the pot size, pot the hand history if you got it