I love watching footage of the cast of The Simpsons doing the voices of the characters, and this has to be the ultimate clip. Here Dan Castellaneta describes the origin of Homer Simpson’s annoyed exclamation – man, this guy has talent. The clip is from an Archive of American Television special, and if you want more fun behind-the-scenes scoop on one of the greatest cartoon shows of all time, this bit where Castellaneta talks about the show’s legacy and cultural impact is quite enjoyable.