Mentos In Coke
You might want to save this prank for a friend who doesn’t take his caffeine addiction too seriously. CAUTION: consider this a volatile experiment that requires finesse! Place Mentos in a bottle of soda and quickly put the cap back on because once you insert the Mentos, a volcanic eruption is soon to follow. Place the booby-trapped soda back in the fridge. When your friend takes a gulper, just be sure to be clear of the blast zone.