EPTHere is a random embedded Youtube video, the only purpose being once you hit play it will be in focus, so you can do it. You can do it on any normal part of Youtube (non embedded) as well, but you'll have to click on the player once while it's loading to bring it into focus before your worm disappears!
Start hitting the arrow keys while the worm does its little loading circle thing. Take care to not lose your worm beyond the confines of the screen though! It may be taken from you by a bird of prey.
edit - And yes, I am easily amused.
