This very thing happened to me yesterday in a full ring game. (Played for about 6 hrs. yesterday.) I had pocket 8's, one before the button, bet 4x BB. Button called, everyone else folded. Flop came 89K rainbow. I put in a smallish bet, one-third pot size, trying to disguise my hand. He bet me all in. I jumped on it, putting him on maybe TT or 2 pair. Showed it down and he had the set of 9's. Impossible to get away from this after only the flop.

Also, during that long session, this happened to me TWICE: I flopped a full house, bet all in and got called, and got beat by a bigger house on the river. Painful.

This is my first post on the site, though I've enjoyed reading your advice. Just started playing this past summer, trying to get better....