Here's my puzzle. Let's say you call a modest raise with T9 suited in middle position. This is a short-handed game, 5 or 6 players, and three see the flop including you; you are second to act of the three.
The flop is AA7. Not interesting to you and you're looking for an excuse to fold. But it checks around, so you check.
Turn is a jack, and it checks around again.
River is an 8, giving you a runner-runner straight. The board is rainbow... there's nothing to fear except the remote possibility that someone slowplayed Ax and filled up. Very probably, no one has anything except maybe a weak two pair.
The question is, bet here or not? It seems strongly unlikely that anyone will call based on the way the hand went. You may possibly get a call from someone with a jack or an 8, but I don't know. However if you check, you at least have some chance to get a steal bet from the last to act, and then you can make a little money on the hand.
Typically in situations like these I've bet half the pot and gotten only an occasional call from a worse hand. I am wondering which makes more money in the long run.