The Black Keys have appeared on "The Colbert Report" a few times before... but never like this. On last night's episode, Stephen decided to compete with the "Today" show by undergoing a (fake) on-air prostate exam. He held a reality show-style competition to determine which celebrity would perform it: Patrick Carney and Dan Auerbach, Katie Couric, or John Lithgow, all of whom showed up to make their case.

Not to spoil it or anything, but the Keys' appearance ends with Auerbach saying "C'mon Pat. Let's go check Jimmy Fallon's prostate."

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Watch the Black Keys in a Pitchfork.tv "Daytripping" special: