Will Smith's international publicity tour for "Men In Black III" already produced one moment of viral video goodness when Smith slapped a European reporter who tried to kiss him at a red carpet. But Smith topped that Saturday night on BBC One's "The Graham Norton Show," when he rapped "The Fresh Prince of Bel-Air" theme song along with the entire studio audience in a moment rife with TV nostalgia.

Smith also spoke fondly of the classic sitcom, and marveled at its lasting impact. "Listen, every country in the world, that is the thing that I am most known for. No matter how big the movies get, it's just 'Fresh Prince' everywhere ... As long as they're shouting 'Will!' it's cool," he joked.

"It is so funny that that many people recognize that theme song," Smith continued. "There's something about TV that's different than movies or music. There's something about television that ... it's like, you're in your underwear at the house, you don't get dressed up to go, it's like people come into your house. Television really attaches you to people in a way that is extremely powerful, and it's humbling. Thank you," Smith said to the audience, who had rapped along with him.

