We made a stop over in Jacksonville to see my college friends.
Their daughter knows if she wants to a sure fire way to capture her parent's attention, she can always request 'a science experiment'. So they have a nice repetoire of things to explode, change colors, and mush and gush around. We got to be there for the mentos volcano, where you add a roll of mentos candy to a 2 liter of soda (diet is recommended so sugar does not go everywhere).
Here is what happens: