 Sir Lancelots "horse", Concord, was represented by his servant,  also named Concord, banging two coconuts together. This is cameo of  sorts for the horse named "Concord," who originally appeared, as a  real horse, in Episode 37 of  _"Monty Pythons Flying Circus" (1969)_ (qv). He was the mount for  the episodes title character, Dennis Moore, who happened to be  played by John Cleese (qv).