the video is not as funny as actually being there, since the crappy quality means you can't see all the cola exploding all over josh.
differences from the "mentos and coke fountain":
making a mentos bomb means you stuff the mentos in some open, pliable container (in our case, the cut-off finger of a latex glove), and then shove the open, pliable container into the two liter bottle, and (this part is really important) immediately screwing the bottle cap back on before the mentos hit the cola. this requires two people normally, and some good timing and teamwork. the pressure then builds inside the bottle, and the bottle becomes about as hard as a brick. you can then shoot or cut or hit the bottle to blow the beverage every which-a-way, as we say in the south.