4 – The Ghostly Woman
Back on September 10, 1973, astronauts aboard the now defunct Skylab began to hear a woman’s voice playing over the intercom. Those down in Houston heard it too and, for a moment, everyone was slightly startled. There were only male astronauts aboard Skylab at the time, so where was the voice – speaking of cooking meals and watching forest fires from up above – coming from?
It turns out that astronaut Owen Garriott had recorded his wife during a prior radio chat the evening before, and asked her to read out some pre-prepared statements, punctuated with pauses to allow for a response from Houston to come through.
Played aloud, this had the effect of appearing that a female astronaut had snuck aboard and was engaging in a decidedly surprising, unorthodox conversation.
When confronted with a perfectly understandable “who are you” from Mission Control, the disembodied voice did in fact respond by accurately identifying herself as Helen Garriott, which brought up more questions than it answered until the truth was revealed.
"Well, I see the boys are floating in my direction. I've got to get off the line,” Helen said, signing off at the end of the transmission. “I'm not supposed to be talking to you.”
5 – Pizza Delivery
Coinciding with April Fool’s Day 2013, NASA astronaut Ron Garan, along with fellow marauders of microgravity Mike Fossum and Satoshi Furukawa, phoned a pizza place back in Houston – one that boasts that it can deliver a pizza anywhere in the area in 30 minutes or fewer – from the ISS, and challenged them to match their words with (some considerably unorthodox) action.
Disappointingly though, according to Mashable, the call was fabricated and no pizza was actually ordered. Hopefully, this’ll encourage those currently aboard the ISS right now to do this prank properly on this year’s day of jovial daftness.