"I don't think Americans know what Kinder Surprise is..."

I only know about them thanks to the legal hullaballoo there is about whether they're legal to sell in the US. (Short answer: they aren't. (http://www.law.cornell.edu/uscode/text/21/342) Long answer: Under U.S. Code Title 21, Section 342, they're marked as an "adulterated food" due to being a confectionary with something wholly embedded in them that serves no functional or nutritional purpose.)