If this were any sort of educational website, this is the part where I'd explain to you about how the chemical reaction of Coke and Mentos works. Instead, I'll just quote the great chemist Jesse Pinkman, "science, bitch!" If you really wanna know, Wikipedia. Otherwise, here's some Coke and Mentos GIFs for no reason other than mindless entertainment. 

1.

Source: giphy

2.

Source: gifyoutube

3. 

Source: gifsoup

4.

Source: giphy

5.

Source: colarocket