In The Hitchhiker's Guide to the Galaxy, the comically anguished scream presented as "this recording of a man being put into the Vortex" is actually a recording of Simon Jones reacting to a piano lid smashing his fingers.
During the episode "TV Documentary" of The Navy Lark there's been a Running Gag about Leading Seaman Riddle being called to the Bridge but he never turns up. During the climax the messenger says that he realises where Riddle has been all this time.
"I'm Reading Seama-" [audience explodes with laughter and the actor stumbers for a short while] "I'm Leading Seaman Riddle!" [audience cheers]