If you think of Mentos, you probably think of those annoyingly snarky commercials from the early 90's that featured people getting away with obnoxious behaviors under the influence of them (sort of a milder version of the Twinkie Defense).
Recently, people have discovered that combining Mentos and diet soda results in a gyser of liquid. The folks in this video took that insight to the extreme by producing a spectacular Mentos and Diet Coke fountain show.
Thanks to my good friend Arturo for pointing me to the link.