One of the funniest memories I have is being in the car with two stage actors (brothers, and semi professional sort of quality) who were having an argument about something whilst I was driving them to a rehearsal. One started doing a Michael Caine voice to add some emphasis to a point for some reason, then the other one retorted back in his Michael Caine voice. Suddenly, Michael Caine was having an argument with Michael Caine in the back seat. Was funnier than it sounds, and I had to slow down as driver because my eyes were watering.