Well, one is a "professional rapper", while the other is a "classically trained beat boxer", what could go wrong? In fact, you're willing something to go wrong because this performance is just PERFECTION. No wonder Fallon's voice is hoarse; he must've been practising, like, loads.
No one knows why this happened, or why Will Smith is dressed like a middle-American dad circa 1976. It all remains a mystery.
