Co Ed Magazine has a piece up called "10 best catch phrases of all time" or something like that. Each of these catch phrases is derived from a mainstream TV show or movie, which has in turn become a widely-recognized, often spoofed piece of language.
Linky: http://coedmagazine.com/2010/06/15/10-greatest-catch-phrases-of-all-time/
This has me thinking about other catch-phrases like, "Thank You, Captain Obvious" and "I came" which are also rooted in places other than the internet.
I think it's worth opening up a discussion about how catch phrases originate elsewhere, but are often used online, blurring the line between "Internet Meme" and other pop culture memes, since we're headed in a direction where they're one in the same.