None other than John Heald himself.
I'll assume he isn't using his toilet jokes on the passengers, or the other bodily function humor that he finds so funny.
The British seem to have a quirky sense of humour and a stiff upper lip. The destroyer HMS Sheffield was hit by an exocet missile in the Falklands. When the crew was waiting for rescue from the rest of the fleet, one of the officers on board started a sing-a-long of "Always Look on the Bright Side of Life" from the Monty Python movie Life of Brian.
Anyone for a sing-a-long on Lido Deck?