The IT Crowd - Incorrect Voicemail
In Series 1 Episode 5, "The Haunting of Bill Crouse," a perturbed Jen leaves a message on the answerphone of Bill 'The News' Crouse, who believes Jen to be dead. after he has been claiming that he was the last person to sleep with her.
When she records the message it is: "Hey, its Jen, stop telling everyone I slept with you, you bastard!"
However, when he plays it back, it goes: "Hey, its Jen, stop telling PEOPLE i slept with you".
Episode 5 of Series 1