After (or before?) opening for Lady Gaga, Kid Cudi has apparently been hitting smaller venues -- like Kool Haus in Toronto. And after he surprised the Montreal crowd the day before by performing "Make Her Say" with Gaga, Cudi invited a guest of his own to the stage in Toronto. And everyone proceeded to lose their mind when Toronto-native Drake stepped out. While it's difficult to hear him over the backing track (note to rappers: STOP doing this), Drake performed the hook and his verse from "Forever" -- the studio version also features Lil Wayne, Kanye West, and Eminem.