I wish I could even count the number of times I've lost top 2 pair vs. 3 of a kind. It's really one of the hardest laydowns to make, IMO. It's so easy to convince yourself that he's got some weaker 2 pair hand even if the board just doesn't go along with that. Or you just convince yourself that the other guy is bluffing. Or you say to yourself "Damn it, he made a set" and yet you STILL find yourself clicking on the Call button. At any rate, being able to lay down top two pair with no flush/straight draw made is something I just haven't yet been able to do