The Social Implications and Etymology of "Asshat"
This conversation from the comments on AV Club's "My Year of Flops" could well be one of the funniest things I've read all week:

First person says: "grey-box word: asshat. Your number-one sign that nothing in the comment is worth reading. Including this one."

Causing Sriad to reply: " I rather like the term. It suggest that, rather than being a shit-brain or a pig-fucker, the individual in question is simply wearing an ass on their head. Maybe when the ass comes off, they're a nice person, but right now the ass-hat is on, and it needs to be pointed out."

imaperson submits his interpretation: " I always visualized a person wearing a hat on their ass, making perambulation rather difficult."

Enlightened disagrees: "Nay. The reference is to one whose head is up one's ass (usage: That BMW driver who is weaving from lane to lane is an asshat)."

btw, anyone who is a bad film fan either really needs to read "My Year of Flops," or should be kept from reading it for their own safety. I already have "Free Money" in my netflix queue because the author's panning of it just made it too irresistible.