The runner runner that so horribly sticks in my mind was like this,
I have K 7 in hand, i make a bet, a number of people call 9, K, 7, come out on the flop, people check around me, it's a reasonable pot not too big not too small. But i want the chips, so you guessed it all-in. Only one person calls, this person had something stupid like J, 4. I think to myself, "the guys a mug" then guess what, i'm the one who gets mugged by a runner Q and a runner 8.
The only thing i can honestly think is that the guy believed he had the two types of cards as outs, when experienced players know that an out only counts when you have that one type of card to make the hand.
At miniture stakes and amateur live games they are the type of plays you have to play against. People sitting there thinking they have 4 more outs then they really have and hitting them. When it comes to the flush 3 card draw, people think they have all them outs too. That's another 11 outs they are thinking about, plus whatever kind of mad equation that is going through their mind
