It's more an instance of when you both go all in, cards are flipped, and you have the stronger hand with the most outs as well. At that point in the hand, you outplayed your opponent and only a good amount of luck will make it so they beat you.

Good example is a tournament I was in 10 years ago. 60 people, and the guy to the left of me at the first table had no idea what he was doing. First hand, I get pocket kings and push pretty hard. He not only calls, but raises. Everyone else drops out. He keeps calling my raises after the flop (everything out there was low, no pairs, and no flush or straight draws... especially when he is playing like he has a strong hand). After the river, when we both had half of our chips out there (and most of that didn't come after betting on the river) we flip and it turns out he pulled a lucky two-pair (3s and 7s) on the river. Up to that point, he was calling and raising me with a pocket 37 that were off suit. He had no business being in that hand and the rest of the table were dumbfounded that he stayed in.

Very next hand, I pull AK off suit. I raise pre-flop, he calls, and everyone else folds. Now this guy just called everything with nothing in his hand, so after the flop (where I caught a king) I go all in. He calls again. I flip over my AK with my K pairs... he flips over an off-suit 67 with nothing. Again, I'm way ahead and he had no business calling. Sure enough, he catches a 6 and a 7 on the turn and river to win and knock me out of the tournament in the first 3 minutes. Actually had players at my table apologizing to me and talking crap about the guy because he just lucked out and played horribly. I did everything right in those hands, but lost due to some bad beats.