Both Bart and Homer made the cut in our ranking...

Both Bart and Homer made the cut in our ranking of the 75 best TV characters of all time. Credit: Fox

"The Simpsons" have put together a couch gag for David Letterman - already - and it's certainly worth watching, heaven knows. (I mean really: You haven't really done anything until you're the subject of a couch gag, right? Guess Dave's done something...)

 Set to "Rhapsody in Blue"...but you knew that...

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