We all know what happens when Diet Coke and Mentos mix together - you get an eruption of soda. But by freezing the Mentos, you can delay the explosion and watch an unsuspecting victim's eyes widen as their drink suddenly overflows!
Add water to an ice cube tray about halfway in each cube hole. Place it in the freezer and chill the water so that it's almost freezing, but not solid yet.
Add a Mentos to each cube hole. If the water is not cold enough, the Mentos will dissolve and the trick won't work.
Place the ice cube tray back in the freezer until you get regular ice cubes. You'll see that the Mentos is solidified in the ice cube.
Pour a glass of Cola and drop some Mentos ice cubes into the glass.
Wait until the ice has melted. At this time, the real Mentos will be in contact with the soda and will make the soda overflow out of the cup.
Know the victim well enough to know how he or she will react.
Make sure the victim doesn't drink too much of the soda before the ice has a chance to melt.
You might want to freeze the Mentos before placing them in the ice cube tray. That way they won't melt before the water freezes completely.
Be sure that you're in a place (i.e. outside or in a room with easy-to-clean floors) where you or your victim won't mind cleaning up a lot of spilled soda!
Be aware of what the victim is wearing, so that you do not accidentally ruin an expensive outfit.
Make sure victim will not be enjoying their beverage near their computer or other expensive electrical gadgets.
Things You'll Need
Cola (Diet colas are preferred - they don't get sticky when they dry - but any will do.))