Yeah, I had heard about it, but didn't believe it. So while camping a couple weekends ago, we picked up a 2 liter and a box of Mentos...that video is pretty cool, but you ain't seen nothing until you've laughed at your friend getting doused by a geyser of diet Pepsi!!! There was less than half the bottle left after the fountain ended...it's much more spectacular in real life...
They said that had to drill small holes in 523 mentos so they could tie a piece of monofiliment (fishing string) through them for their release mechinism.