Here's something I stumbled across tonight. Playing against a small stack with a decent hand, something like KQ, and the flop is Qxx. On the flop, small stack leads out, and everyone folds to you...there's nobody else to act behind you. Small stack has maybe 15-30 BBs left, but you know you're not getting away from the hand no matter what for that price. So I push it all in. And I don't just bet what he has, I shove in 150BBs, or whatever I've got. He calls, and I either win or lose -- mostly win -- but either way I show that I'm going to shove my whole stack in with TPGK. Which of course I'm not really going to do. And an observant player will catch that. But there aren't too many of those, and even those who are might be 5 tabling and only see the result.
Either way, it's a free play. You're going to get the guy all in there anyway, you might as well give it a shot.