I agree it's an automatic fold. This has been (and I still struggle with it) one of the biggest leaks in my game. The last time it happened I lost my whole stack. Part of my problem is playing the players rather than watching the signs closely, I was in LP at 100.00 NL, one awful player raises to 6X the BB ($6.00) he had one caller (also very weak) and I raised to $20.00 with QQ trusting to take it down right there. He called with 66. The other player folded. Flop came down with 2 clubs and a 6. He checked to me and , knowing from observation he loved draws, I bet $50.00 which was close to a pot sized bet. He went all in and I had another $40.00 - 50.00 dollars, which I stupidly threw in, and no I didn't hit my two outer.

As discussed by others, when you are the preflop raiser and you get check raised on the flop, including AK when an A or K lands, you know that the player has put you on a high pair and is fully confident he can beat you. I still find this is the hardest lay down for me, I've got to get over knowing I was way ahead pre flop but I'm going down to an unknown hand. This is one of the unique difficulties of playing on line poker. If it was live you would have to stop, evaluate your stack and then physically push the chips into the middle. Online, it's one angry mouse click, because you are so horrified the stupid idiot is doing this to you.