What's The Difference (Dr. Dre) Easter Egg - Xzibit and Riddick

The song 'What's the Difference', which can be found on Dr. Dre's '2001' album, is sung by Dre and Xzibit. One of Xzibit's lyrics is "I smash you critics like a overhand right from Riddick". At the time of this songs production, Xzibit was doing some voice over acting for the Xbox game 'Chronicles of RIDDICK Escape from Butcher Bay'.