Force ping was is an ancient Force technique, utilized by only the very, very, lowest of creatures; even the Sith wouldn't go that low. So when I say low, I mean really low, I mean so utterly low, that it's only recorded usage was by Luke Skywalker. It involves using the Force to ping the bra strap of your opponent, usually a woman. It was used in the historic battle of Darth Raving vs. Luke, and some historians believe that Luke may also have used it against Palpy – the only reason he won.