Joke for Scots!?

Frightfully good, What? did you hear about the spaceship flying over the Mississippi and the captain saw a black man rowing a boat and singing 'Row along on de Mississippi' he didn't like the noise so he had the science officer beam him aboard for examination. The science officer said that the noise was generated from the larynx and controlled by the brain. The captain had the science officer remove Rastus's brain and scramble it in a liquidiser and replaced back in the cavity. he then beamed him back aboard his rowing boat. no sooner as he reached the boat he picked up the oars and started singing 'Flower o' Scotland' Don't you just love ethnic jokes?