Penn Jillette and the silent Raymond Teller (though he never uses his first name) have performed together since the late 1970s, combining comedy with magic. They claim the record for the longest running headliners to play at the same hotel (The Rio) in Las Vegas history and have made TV shows such as Penn & Teller: Fool Us and Penn & Teller: Bullshit!, which was based on their scientific scepticism.