There have been a few videos on yo-tube/google videos about diet coke and mentos
So we had to try it out.. Our first experiment failed dismally (we used a can of lemonade
poured into a bottle + 2 mentos.. (Various suggestions from people who sounded like they knew
what they were talking about then had us try several things (including microwaving the lemonade first))

Try #2 1 x 2l Diet Coke (ok.. coke lite)

Drilled a tiny hole down the center of about 10 mentos

Hole + Flattened PaperClip == Mentos Cartridge

The end result.... (Tiny video till we get the uber one from roelofs uber camera)