One of the first viral videos in the history of the Internet involved men in scientists jackets throwing Mentos into large bottles of Diet Coke. Well, not much has changed in 10 years. People are still throwing Mentos into large bottles of Diet Coke, but the results are different. Take a look at these guys, but be prepared to... DUCK!
And in case you forgot, here's the original mentos video that pretty much started the internet.