I know this is wasteful, but it looked like so much fun to do. You can go to
Wikihow.com and see how to make your own Mentos Volcano. If you do it right, you can make a
Diet Coke spew 10-15 feet in the air. Perfect to do if you are extremely bored or if you have kids you want to impress. Per
Steve Spangler Science the record is 18 feet.
I did this a about a month ago and had the bottle spew 10-15 feet of
Diet Coke. Most directions say you can do it in the bathroom, but I would not recommend that if you have short ceilings.
Photo from Steve Spangler Science