Last night (March 13) on Late Night, Jimmy Fallon and this week’s musician-in-residence, Justin Timberlake, donned the monstrous white coifs and dad suits (but not ties) of Michael McDonald for a very adult-contemporary version of “Row, Row, Row Your Boat.”

Both Timberlake and Fallon, who have proven to be oddly-skilled mimics, pulled out on-the-nose impressions of the Doobie Brothers singer. But the performance was absolutely made when McDonald himself showed up.

McDonald is no stranger to self-deprecation, having appeared in a few episodes 30 Rock, so it wasn’t a total surprise when the crooner appeared as the third voice in a heavily harmonized white-funk version of the children’s song.

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