Drag Bunt
A bunt for a hit: the batter is already running as he bunts.
How it actually works. A left-handed hitter drags it toward first, stepping into his run as the barrel meets the ball so his momentum is going the right way before the ball lands. A right-handed hitter pushes it the other way, past the pitcher toward the second baseman, which is the longer play for the defense. Either way the bat comes out late, so the corners have no time to charge.
Why it is done, and when it is wrong. The difference between this and a sacrifice is entirely about when you show it. A sacrifice is shown early because the defense being ready costs you nothing, you were giving up the out anyway. A drag bunt is a race, and every step the third baseman takes in before contact is a step you cannot afford. That is why it is a fast man's play, and why it is worth more against a defense that has already backed up because the hitter behind him has power.
What people get wrong about it. It is the most weather- and surface-dependent play in baseball. On a wet infield or heavy spring grass the same bunt dies six feet sooner, which is the difference between a hit and an easy out. Good bunters look at the grass before they look at the defense.
At Little League and travel ball. This is the single most underused play in youth baseball. A fast player who can drag bunt will hit close to .500 on the play at most travel levels, because the defense is not drilled to cover it and the throw is long.
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