 Tonight in London, a famous prophecy by the Simpsons is being fulfilled. Nearly 30 years ago, an episode of the Simpsons animated TV show featured a joke about the hip-hop group Cypress Hill. NPR's Lauren Frayer has the latest from London. Who is playing with the London Symphony Orchestra? In this 1996 episode, the Simpsons joked about Cypress Hill booking a performance with the London Symphony Orchestra by mistake because they were high.