Haha, did not know that.
Reminds me of the whole middle eastern thing with shoes. Shoes are considered exceedingly unclean, so being hit with one is extremely insulting. But if you don't really have that background (I mean, shoes are dirty, sure, but it's not like they're covered in feces or something) they guy who got up and threw his shoes at GW Bush just looks kind of weird and silly.
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I'm bored out of my skull, let's play a different game. Let's pay a visit down below and cast the world in flame.