US rapper Eminem made a surprise appearance on the radio earlier this week disguised as a prank caller.

The rapper, who is currently recording his new studio album, phoned into his own radio station, Shady 45, during a live chat with the rapper LL Cool J.

Calling under the pseudonym 'Jason from Miami', Eminem challenged Cool J to a game of Name That Tune, where Eminem would recite Cool J's own lyrics and the rapper would have to guess what song they were from.

“Hold your nose, dead bodies are around/ I leave scratch marks under the tears of a clown," Eminem rapped, to which Cool J immediately replied: 'Eat 'Em Up L Chill'.

After receiving praise from Cool J for his rapping ability, Eminem finally broke out of his character to rap is own song 'Lose Yourself', causing Cool J to erupt with laughter.

Eminem then set the rapper another challenge - he asked him to collaborate with him on a new record.

"Listen, man, you got this relationship with Dre," Eminem said. "You're cool with 50, so when are we gonna hang out? I got cable at my house, and the game is on."

(by Jason Gregory)