[Vehn]

When you're in a position to "take one off" with a 5 outer such as bottom or middle pair when you're very sure it won't be raised behind you, making your hand almost certainely won't make a 2nd best hand, and you have the pot odds to do so. This doesn't come up that often I agree.

There are also certain opponents (mostly tight old men) that will raise preflop with whatever, bet the flop, and always check the turn with their naked overcards and always bet the turn with an overpair. Check calling the flop with the intention of check folding the turn is probably correct here with a lot hands, even "only" a gutshot etc etc.