There is a famous saying in poker: "Any two cards". This relates specifically to Texas Hold 'Em, by far the most popular variation at the moment, both on-line and in the real world.
The screengrabs below are all from hold 'em tournaments. I have but rarely played hold 'em cash games, and would not recommend it, certainly not the no limit kind. These are all low limit games, most of them freerolls, due partly to my chicken-hearted nature, partly to my belief (unlike Milton Friedman) that there is such a thing as a free lunch, and partly to what little wisdom I have. These are not all hands that I have played personally or that I was involved in. As far as can be ascertained, they are in chronological order.
May 9, 2012: He flops top pair and thinks he's in front. Oops!
The second of two screengrabs from a freeroll played October 18, 2012. Raise and flop two pair, you're probably in front, so why not whack it all in to shut out the draws? Because the other player may have a set?
In Hold 'Em On The Cheap, I said I was finished with no limit hold 'em sit and go's. That resolution didn't last long! Immediately below are three screengrabs from a small bounty tournament. These are a variant of head hunters, or vice versa. The small fry below had 9 runners, paid 3 places and had a buy-in of $1.00 + 27c + 15c. I finished 3rd winning $1.94 and 81c in bounties for a total of $2.71.
October 28, 2012: I stayed out of this one. 5-2 suited. What a player!