Jimmy Fallon and Taylor Swift Get Geeky in 'Ew!' (VIDEO)

Taylor Swift professed herself to be a geek of sorts in the "You Belong With Me" video, but we haven't seen much in the way of nerdiness on her part in recent years. Until now, as she appeared on The Tonight Show Starring Jimmy Fallon last night to take part in "Ew!", a sketch that kind of has to be seen to be believed.

Okay, maybe that's a bit hyperbolic, but it does feature Fallon in full "teenage girl" regalia, and Swift sporting some fairly convincing braces, as two friends basically sit in a basement and talk about things that gross them out in what is meant to be a fake Teen Nick show. Watch the full video below, and marvel at how Jimmy Fallon can be the nicest guy in Hollywood, but also its ugliest fake-teen girl: