I had been about to post a number of theorist lolmemes I found by accident at KSCakes's lolcat builder, but as it turns out someone beat me to it. There are some missing, though: people (including myself) were doing some on Chomsky (dammit I lost mine!), Henry Jenkins, and McLuhan; and there are some Feynman ones that didn't get in either, though he's been kind of done to death. Look for the Freud and Buddhist ones; they're so cheap, but so satisfying. So many of these theorists brought this on themselves :) I bet these would make good teaching aids in a low-level theory class...

ALSO: See LOLHistory.