Humans are STILL weird.
Yes, I’m still at it. I can’t stop. Send help.
Human language is very difficult. Too much is conveyed by body language and what they call ‘tone’. Thankfully Humans are patient with misunderstandings, and largely shrug off difficulties and explain as needed. No one is quite sure what the word ‘fuck’ means, and they are all afraid to ask. Its use is wide and varied, and too often leads to violence of one kind or another.
When Humans began signing on as crew for multi-species vessels, they began hauling in all sorts of… things. Things that had NOTHING to do with their abilities to do their jobs. Musical instruments, pictures that were cut to pieces which are then reassembled painstakingly, chemical enhancements imbibed for recreational purposes, miniature pre-contact transportation vessels built in containers of glass that serve no evident purpose, meters and kilometers and LIGHT YEARS of string and sticks and small fiddly bits.
“What do you do when you’re not working?”
“Prepare for more work.”
“Wow. Sounds boring.”
Really, not just knitting. The construction of any and all garments on-board ship. Often garments that serve no clear purpose. All needed gear is issued upon arrival. So why is that human standing watch with a handful of long metal wires and a ball of string? AND HOW DID IT BECOME A SOCK? WHY DO THEY KNOW WHAT SOCKS ARE? Crocheted lace is banned among some species because it triggers a closed-loop neurological function when watched.
It’s not so much being bored that confuses other species. Any beings who traverse the stars are familiar with moments, sometimes long moments, of nothing to do. It is Humans’ approach to this feeling that is unusual. They DO THINGS. Too often, they involve others. “Bands” playing harmonious sounds. “Movie Night” becomes a thing in Human space, so common that for a long time other species thought it was a ritual of some kind. They include the rest of the crew; the crew is usually confused by Human ideas of entertainment. Attempts to share stories in the other direction only lead to the Humans themselves being confused.
The first Human to introduce rugby to a ship as a way to kill time was nearly tried for mutiny.