The following Vine was posted by "Epic Meal Empire" host Harley Morenstein:
So why do Mentos and cola result in such an eruption? Explains Amanda Kooser at CNET: "The secret to the massive bubble explosion is in the shell coating the candy. Tiny nooks and crannies encourage the soda's carbon-dioxide bubbles to form around the candy's surface, quickly multiplying until you get the geyser effect."
h/t Laughing Squid