Open the pack of Mentos and place all of them in the tube. 1. Slowly and carefully open a new bottle of Diet Coke. 2. Place it on a flat ... Wash your hands after the experiment.

Open the bottle of Diet Coke and set in on a surface you don't mind getting wet. Drop as as many Mentos as you can (it helps if you have a funnel) into a 2 L bottle ...