Last night I played in a no-limit cash game on line in which there seemed to be a higher than usual incidence of players showing their cards when a hand didn't end in a showdown. This was great for me because it gave me a lot of insight into these players' strategies; that insight helped make it a very profitable session. I don't understand why they kept doing it, but then I don't understand why anyone would ever show cards they don't have to. But I'm admittedly new to seriously studying this game, so I ask y'all -- is there a good metagame reason to occasionally reveal your hole cards? If so, when do you do it?