Perfectly Looped Spacemen
Adam Rifkin stashed this in Perfect GIFs!!!
Redditors explain this one:
I think I understand how this was done. It's just one person multiplied and played at different times to look like more than one person.
Yeah, it's one guy. He starts on the right and acts out each motion until he's on the left. Then it's just copied 4 times and blended into the same gif.