Scott Kelly gorilla costume ISS Scott Kelly/NASA

If you never thought you'd live to see a gorilla menacing crew members on the International Space Station (ISS) in zero-gravity, think again.

Okay, so it's not a real gorilla. But it's arguably even better.

To lighten the mood up in the isolated and cramped quarters of the ISS, astronaut Mark Kelly sent his twin brother Scott Kelly — the first American to live in space continuously for an entire year — a care package.

In that package was a gorilla costume. And when Scot Kelly put on that gorilla costume, well, you should watch the video to see what happened next:

This isn't the first time a nonhuman primate has been in space. Before we knew it was safe for humans, scientists flung several different species of animal into the void — usually monkeys, chimps, and dogs — to see how they'd fare.

The first primate astronaut, Albert I the rhesus monkey, was launched on a V-2 Blossom on June 11, 1948 from White Sands, New Mexico. While Albert I didn't fare so well, he effectively kicked off the primate space race.

space monkey This isn't Albert, but is Sam, a rhesus monkey, who flew to an altitude of 88 km in 1959. NASA