At this point, roughly 95 percent of YouTube is devoted to variations on “The Harlem Shake,” that dance-fad thing the young people seem to be into these days. (The rest of YouTube consists of “Gangnam Style” parodies.) It seems like everybody short of the Vatican is sharing their take on the ubiquitous dance sensation that’s sweeping the nation. That now includes The Simpsons, who have entered into the fray with an exuberant clip that will undoubtedly age like a fine wine and not be something that everyone involved will be embarrassed by a week from now. We here at The A.V. Club are all about reserving judgment, so we’re just going to focus on all the joy The Simpsons has given us through the years.