What the heck this is: Banned in the U.S., Kinder eggs are made of chocolate and filled with little toys. Surprise eggs are made of plastic - so they're legal here - and also filled with toys. Anyway, people make videos of themselves opening these eggs, and little kids watch them for hours.
Biggest WTF fact: The unrivaled star of this genre is "Disney Collector," who has notched more than 2 BILLION views of her videos on YouTube!