Memes explained! This thread has a posse. →[More:]

Ok, so I noticed someone other than Charles Darwin with a posse, so I decided to look it up on teh wiki. And now I know where the "OBEY" image comes from.

What mysterious or obscure memes (including IRL ones) do you know the backstory behind? Enlighten us, that we may seem all the cooler and more erudite at social functions!