It’s pretty well-known that diet coke and mentos DO NOT go together.
The usual mentos challenge is this. You put a bunch of mentos in your mouth and try to consume a 2 liter bottle of diet coke spilling as little as possible. The chemical reaction produced by the coke interacting with the mentos causes it to burst out causing people to spill coke while consuming it.
And this, is a new way to play the mentos challenge.
Source : buzzfeed.com