 According to an interview with Malcolm McDowell (qv), the actor  often kept Stanley Kubrick (qv) highly amused by his ability to  belch on command (as illustrated at various points of the movie).  The actor and director also passed the time obsessively playing  table tennis (a sport which appeared in Kubricks earlier  _Lolita (1962)_ (qv)); McDowell was later irritated to find that his  salary had been docked for the hours spent playing the game.