If we had to choose just one song to dance to for an evening, we'd consider making a playlist entirely of R. Kelly's "Ignition (Remix)." It's also one of our go-to karaoke songs. And, we have a similar adoration for Jimmy Fallon. So, when you combine the two, what happens is a beautiful, beautiful thing. Last night, for his second episode of the Tonight Show, Fallon joined a barbershop quartet and delivered his own rendition of the R. Kelly classic. We know what you're thinking: How could anyone ever attempt such glory and succeed? But, trust us, if anyone could pull it off, it's Fallon.