Youtube alone has more than 11,000 videos about “mentos coke”. One video on Revver had more than 10 million views and the phenomenon was reported on television shows like MythBusters and the Late Show with David Letterman. The experiment also gets headlines regularly as Guinness records are challenged around the world.
On the 23rd of April, 2008, students in the Belgian city of Leuven (shown in photo above) set a new world record, simultaneously launching 1,360 Mentos geysers. (Unfortunately for them on May 14, 2008, students at Louisville Male High School broke this record by setting off 1,800 reactions at the same time).
This has to be the biggest ROI in history:
Cost of campaign = $0. Value of promotion = more than $10 million.