Bradley Cooper stopped by The Tonight Show this week on his ongoing promotional tour for his No. 1 movie Limitless. He admitted that he's been addicted to checking Rotten Tomatoes, compulsively refreshing to see if Limitless earned a fresh or rotten rating (and only reading the worst reviews!). But the really exciting news is that he revealed a little more information about that monkey we've seen in stills from The Hangover Part II. Watch the cute interview!