Jeff Glover's Marcelo-like Guillotine

Note the snapdown on the head. Glover goes for the guillotine a couple of times before they spill out of bounds. He waits for the guy not just to go head-to-head with him, but for the guy to be leaning forward. The guy doesn't realize that he's sticking his neck out, but he is. And when Glover gets the arm under the chin and then snaps down on the head, the guillotine is perfectly set. Very fast.