People do dumb things for their 15 minutes of fame, and this guy attempted to be one of those people. He wanted to take the Mentos/Coke thing to the next level, obviously at the risk of his own life. http://youtu.be/2U6Dczl0rdQ

As you can see from the results, the outcome, well...  Don't repeat the experiment, as you'll be wasting a lot of perfectly good Mentos and Coke.  Besides, it's already been done before.