You just freeze a mint flavored Mento in an ice cube and then make a drink for a friend (read: enemy). Any artificially sweetened soda should work, but preferably something darker so the frozen Mento isn't so obvious. Then, a few minutes later when the Mento is exposed to the soda, BOOOSH! Alternatively, garnish your friend's glass with a live hand grenade.
Mix an Exploding Drink [wired]
Thanks to Towhee Monster, who once bit a Snap-N-Pop to make it explode because she's hardcore.