Attendees at the Coachella festival in California yesterday were given a rare treat. Snoop Dogg and Dr Dre, two of the biggest stars in hip hop were joined on stage by a surprise guest - Tupac Shakur. Tupac saluted the audience shouting 'What up Coachella' before launching into one of his hits. There's only one thing strange about this, Tupac was shot dead in 1996. The hologram effect took 4 months to create and is chillingly real. Apparently this apparition now has a Twitter account. Tupac is back from the dead!