Last night on The Tonight Show, Nicki Minaj disclosed the progression of her cat fights with American Idol co-judge Mariah Carey: "A lot of it starts off, we're just joking, but we're passionate, we're both crazy, and then sometimes, it just goes 'Rrreowww.'" And along this vein (of tiger blood), Charlie Sheen didn't fail to entertain us with his talk of crack cocaine, a psychiatric self-diagnosis, and yet another Two and a Half Men zinger. Sheen admitted he would like to appear on the finale episode, to which David Letterman interjected, "You know, I think they killed you off", and Charlie responded, "Well, no, I am dead, but so is the show." (Seriously, between Nicki and Charlie, you could watch their interviews on mute and let their facial expressions do all the talking.) Plus: Christoph Waltz had a bad hangover; and Jimmy Kimmel and Ellen DeGeneres really, truly, deeply love each other. Watch our compilation to see what you missed.