This is when you leave a block of C4 at your feet then walk off and hide somewhere waiting for them to turn the corner before you detonate! Or maybe build a complete life size version of yourself out of C4, paint it to look like you, put clothing on it, stick a gun in it's hands and hide it somewhere like it's slightly sticking out so when someone jumps in to knife it, you hear the explosion from 20 miles away! Leaving a 30 foot deep crater.