Charlize Theron and Jimmy Fallon didn't look like their usual selves on Monday. That's because the actress and Tonight Show host wore outrageous costumes they picked out for each other. At first, Jimmy and Charlize tried to figure out who exactly they were meant to be, leading up to a silly giggle fest. And then Charlize channeled her inner rocker, picking up a guitar for a jam session. Try to figure out the random moments in the video above, then watch the latest viral videos.