Even if you don't want to listen to the song during the credits, skip to the last 20 seconds or so. There's a little extra bit at the end.
Anyways, this is the skit from the end of the most recent Simpsons episode (Season 22, Episode 8: The Fight Before Christmas) in which they parody a Muppet's Holiday Special.
With some extra Katy Perry, of course. I mean, how can you live without it?
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