Alternatively, throw a pinch of sand on the keyboard, close the lid, bag the Mac. Now, with some vigor, take it out blindly by any corner and trow it down on the thick wooden table, slamming it with it's own weight.
Macbooks are easily the flimsiest devices I own if not for the display alone. I've dropped a Thinkpad out of a moving vehicle, and it booted up like nothing happened. My Macbook tumbled 2 feet onto a concrete floor and now the $600 topcase is destroyed...
There used to be a thick glass panel in front of it, but no more.