A Tight Pants Showdown With Jimmy Fallon, Jennifer Lopez

Imagine a mythical land -- a small town, really -- where there's only room for just one inhabitant to sport some tight, tight pants. How would people challenge each other for tight-pants supremacy? Last night on 'The Tonight Show,' just such a showdown hit the screen, when host Jimmy Fallon deluded himself into thinking his tight pants could somehow prove to be better, badder and tighter than Jennifer Lopez's tight pants.

How wrong he was! Behold, a "Tight Pants" challenge, complete with an eerily catchy song and a bit of a shocking turn from J-Lo. She will cut you!