Mentos Geyser Tube

The Mentos Geyser Tube ($5) is a small clear tube that will help you maximize the effect of the best backyard science experiment ever discovered. Just load the Mentos into the tube, lock it onto your 2-liter of Coke (diet works best), pull the pin and run like hell. The little tube will more than double the normal distance of the soda blast — be prepared for your fructose fountain to reach 30 feet or more.