What gets under your skin when playing a poker game?

[bodie]

what gets me is making a "correct" decision to fold a hand, and then sitting and watching it turn into the nuts. I don't care how much you tell yourself it was the right thing to do, it hurts. I'm still trying to attain an attitude of "not caring".
Something like folding a J 4 offsuit and watching the board put down two J's on the flop, and another one the turn.
Happens all the time, I know, but that's what gets to me.