Two-face, I mean Will.I.Am and his Black Eyed Peas performed at last night's Grammys, doing current single "Imma Be" (which is basically the funniest song title to make Miley Cyrus say) and their unavoidable "I Gotta Feeling." The performance of "I Gotta Feeling" is backed by YouTube videos of people singing/dancing to the song. And robots from Wizard of Oz II. Which makes total sense. If you're nuts.