Rappers are never shy when it comes to boasting about their brain smarts. Countless rap songs have been based around the simple-but-egotistical premise of a rapper asserting their lyrical brilliance and worldly intelligence. But they don't always get it right, with even worldwide icons like Jay-Z, Outkast and Run-DMC copping to some gross lyrical inaccuracies in their rhyme vaults. Here then is a run-down of the ten most cringe-worthy lyrical blunders in hip-hop history.