Jimmy Fallon loves doing impression, loves doing musical impressions and loves creating bizarre scenarios in which to do them.
Dressing up as James Taylor and joining the real one on a seesaw is maybe the best incarnation of this variety of nonsense Fallon has brought to the Tonight Show. We love it.
But really, you have to wonder how he gets someone like James Taylor on board for stuff like this. Surely the booking agent talks to him and he's just expecting to come on like a musical guest, play a song, shake a hand and walk away. And then someone says, "Well actually, Mr. Taylor, Jimmy had another idea. It involves a seesaw."