Watch Will Smith And Jimmy Fallon Rap 'It Takes Two' From The Bass Line Up

It takes two (and an iPad) to make it outta sight.

That intermittent screaming loop from "It Takes Two" (YEAH! WHOO! YEAH! WHOO!) will be stuck in your head for the rest of the day after watching this clip of Will Smith on "The Tonight Show," but trust us, it's worth it.

Smith is making the rounds to promote his latest movie, "Focus," thus his sit-down Thursday night on Jimmy Fallon's couch. But on this particular occasion, the host was more interested in Smith's beat-dropping skills.

The two built their performance from scratch, using an iPad app called Looper to layer their beats; it becomes obvious right around layer number five where Jimmy is going with this. When the Roots join in, though, the whole thing becomes a damn fine performance. Check it out below: