I gotta go along with Brent here. I can take mishitting a shot -- I might have a few colorful words or call myself an idiot or something, but I'll usually get over it. And playing a misconceived shot is something I can live with, except if its a shot I've played many times. I'm never very happy with myself when I go for a sucker pin on my home course that I know damn well is a sucker pin but I did anyway because I was feeling bold or just not thinking too clearly about what I was doing.
But if I have the perfect shot for a given situation and mess up its execution, that really bothers me, because that's the kind of thing I play the game for. If I drive into the trees, and I see a little window of opportunity in line with the green way up in the canopy that I know I can hit with an unadjusted 7i trajectory and I just happen to have a 7i distance to the green, but I flinch when I catch some leaves on my backswing even though I knew that was going to happen from taking my practice swings, it really burns me up. Its a missed opportunity for the kind of shot that keeps you coming back, even if it was an otherwise dreadful and unredeeming day. Doesn't matter that the shot itself was not really high percentage, and something probably only Tiger would try in tournament play. If I mess up, I'd rather it be because I pulled it or hit it a bit fat or my eyes were fooling me and I needed an 8i trajectory to hit the opening. Not something stupid and moronic like letting the leaves bug me, or looking up a fraction early or something else super basic like that.