All you need to do it:
Diet Coke (has to be diet)
(My husband told my oldest to keep his head over it....)
What to do:
Add at least 4 Mentos (at the same time) to the pop, stand back and watch the fun! That's it! It's super fun, so you should go try it out!!
The more Mentos you add, the higher the pop goes. The first photo only had 2, the bottom one has 4.