I haven't heard about the Cinnamon Challenge until recently while wasting time idle on YouTube, but apparently it's a really popular dare game where a person attempts to swallow an entire tablespoon of cinnamon without vomiting or inhaling it. 

It doesn't sound extremely harmful, but judging by these many failed attempts, cinnamon is force not to be reckoned with. Whatever you do, DON'T INHALE! Thousands of people all over the world have tried it since it made it's debut back in 2001.

[via knowyourmemes.com]