Drake's OVO Fest had not yet grown into the hip-hop staple it is today when it debuted in August of 2010. The Toronto showcase most notably featured Graham and Young Jeezy, but neither headlining act stole the show quite like an unannounced guest. Eminem walked onto the stage to a crowd roaring with approval and didn't disappoint, delivering his tongue twisting “Forever” verse without stumbling. Drake called him the greatest to ever do it after their performance.