Dropping Mentos into Diet Coke is one of the most popular at-home experiments to perform. When the candy’s porous surface, gelatin, and gum arabic combine with the potassium benzoate, aspartame, and carbonation in the soda, the CO2 gets released incredibly rapidly, producing a tremendous amount of foam. When forced to go through the bottle’s narrow opening, this creates a huge geyser.

He’s either the bravest guy in the world, or he just has a lot of time on his hands. Either way, this man decided to test the limits of the old urban legend – Mentos and Diet Coke.