A video that has already been described by many people as the most hilarious thing they have ever seen re-emerged on Twitter recently, showing NASA astronaut Scott Kelly wearing a gorilla suit chasing ESA astronaut Tim Peake around the International Space Station (ISS).
The prank was done in 2016 when Kelly decided to celebrate his one year in space.
"Needed a little humour to lighten up a #YearInSpace. Go big, or go home. I think I'll do both," the astronaut wrote at the time.
The gorilla costume was sent to space by Scott's brother Mark (also an astronaut) on a resupply mission.