Squeeze Play
Runner on third breaks for home, and the batter must get the bunt down.
How it actually works. On a safety squeeze the runner reads the ball down before he breaks, so a popped bunt or a bunt straight back to the pitcher costs nothing but the out. On a suicide squeeze he breaks with the pitcher's delivery, before the ball is anywhere, and he is dead the instant the bat misses. The batter's job on a suicide changes completely as a result: he is not bunting well, he is bunting the ball fair at any cost, at his shoetops or over his head, because a foul ball is a reprieve and a swing and miss is a tag at the plate.
Why it is done, and when it is wrong. The suicide squeeze is the highest variance play in baseball run per run, and the reason it works when it works is that it is unpreventable once the pitch is on its way. The defense has one counter and it has to be used before the ball is released. Everything about the play is therefore about disguise: the runner's lead cannot get bigger, the hitter cannot show bunt until the pitcher's front foot lands, and the third base coach cannot signal it in a way anybody has seen before. Managers call it against a pitcher who is slow to the plate and with a hitter who can handle a bat, and they call it far more with two outs impossible, meaning nobody out or one out, because the trade is a run for an out.
What people get wrong about it. The counter is a pitchout, or simply a pitch thrown at the hitter's back hip, either of which turns a suicide squeeze into a runner tagged out twenty feet from home with nothing to show for it. That is why a catcher watches the runner's feet at third rather than the hitter's hands, and why an experienced third baseman shouts the moment he sees a lead that is one step too long.
At Little League and travel ball. The squeeze is disproportionately effective in youth ball for the same reason all bunts are, and it is also the play most likely to be blown by nerves. Teams that run it successfully practice the batter's job specifically: bunt anything, anywhere, fair.
Batter's Eye: look up anything in baseball