On September 10, 1973, NASA Astronaut Owen Garriott successfully pranked flight controllers by playing a recording of his wife whilst on SkyLab. There were no women on board the space station and was used to make it look like there was a stowaway.
Controllers in Houston were startled to hear a woman’s voice beaming down from Skylab. The voice startled capsule communicator (CAPCOM) Bob Crippen by calling him by name, and then the woman explained: “The boys haven’t had a home-cooked meal in so long I thought I’d bring one up.”
After several minutes in which she described forest fires seen from space and the beautiful sunrise, the woman said: “Oh oh. I have to cut off now. I think the boys are floating up here toward the command module and I’m not supposed to be talking to you.”
As the Skylab astronauts later revealed, Garriott had recorded his wife, Helen, during a private radio transmission the night before.