Watch a Taylor Swift and Phineas and Ferb Mash-up

We've seen everything from goats to Walter White sing "I Knew You Were Trouble," but we've never seen anything like this. Phineas and Ferbis tackling the popular Taylor Swift song in Friday's episode, airing at 8/7c on Disney.

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Using clips from the series, the video features Dr. Doof singing the pop hit to Perry the Platypus, as he foils all of the doctor's evil plans.

Watch the mash-up at People.