I thought it was one of the least good Mythbuster I have seen. It was just a "myth" that didn't need testing. If I remember rightly that was the speed boat one as well, which was fairly pointless, I suspect the boat in the myth was fibre glass, whereas their test boat was a huge hunk of wood.

Normally Mythbusters is excellent, but there have been a few duff ones recently. I'm just about to watch this weeks one...

Edit:

Hmmm, Ninjas, I have a bad feeling about this.

Edit:

Don't worry, they are back on form

Edit:

Though it is a shame their walking on cornstarch and water lacked some scale compared to the definitive demonstration:

http://www.youtube.com/watch?v=f2XQ97XHjVw