The pair first lip sync to the various tracks at super-speed so that when they play it back at normal speed, it's ever so dramatic!
Elle Fanning got a crash course in how slo-mo effects are made in music videos, so she brought this "speed singing" technique with her to "The Tonight Show" on Thursday.
The actress' first experience came while filming her first-ever music video for one of her own tracks. As she learned, in order to get that dramatic look for the final cut, the performers must first lip sync to their track at rapid speed like something out of "Alvin and the Chipmunks."
She even had a clip of her doing this so everyone could see just how ridiculous and silly it looks and sounds. But that final product is undeniable, with dramatic slo-mo effects for hair and everything else happening around the artist, while the mouth appears to be performing the song perfectly.
Well, not one to let an opportunity like that slide, Jimmy Fallon decided that the pair should to to recreate the drama right then and there, using popular songs like Carly Rae Jepsen's "Call Me Maybe" and the Jonas Brothers' "Sucker."
Honestly, it's hard to decide which part is funnier: watching them try to keep up with the high-pitched squeaks of the tracks at super-speed, or watching how silly it all looks slowed down.
They even upped the ante for their final performance, a duet to Ariana Grande's "7 Rings." For this one, they stood up to create an even more dramatic flare, throwing their entire bodies in the final slo-mo performance.
But there is a ton of potential in this as a recurring game for "The Tonight Show." Just up the dramatics and create entire scenes that have to be performed at rapid speed, and then score on lip sync accuracy. For that final duet, we'd give the edge to Fanning.
If nothing else, though, this is going to have us wanting to see more footage of these very serious artists dramatically performing to the "Alvin" version of their songs.