During The Weeknd's main stage closing set at Coachella on Saturday night, hip-hop icon Kanye West surprised the weekend 2 audience by appearing for a four-song stint that included the rollicking "Black Skinhead" and "All Day" from West's forthcoming LP Help Me God. His appearance sent thousands rushing to the stage and took The Weeknd's already stellar performance to legendary levels.Sunday night headliner Drake brought out Madonna last week and has been clearly outstaged by his Canadian counterpart. In the past, weekend 1 has hosted the heaviest-hitting surprise guests, but all eyes are on Drake tomorrow. How can you one-up Kanye?A just-uploaded YouTube video captures the moment: