While many people tuned in to see Jimmy Kimmel crush his "rap feud" with Kanye West last night, you may have missed another awesome late night moment!

Over on "Late Night with Jimmy Fallon," the other Jimmy had the the guys of Ylvis perform their viral hit "What Does the Fox Say?" -- and it was one very over-the-top performance.

With costume and lighting changes, it was a pretty slick production, one that was elevated by the mid-song appearance of Fallon dancing away in a fox suit. 

There's not much else to say about the performance, other than you just need to watch it immediately.

The duo's original music video, which you can check out below, has racked up over 100 million hits on YouTube in just one month. Not too shabby!


Fallon has had some huge viral moments recently -- from his awesome a cappella cover of "We Can't Stop" with Miley Cyrus and an epic lip sync battle with Joseph Gordon-Levitt.

Can't wait to see what he does next!

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