You did nothing wrong. That is the worst part. You gathered the laundry like a responsible adult, you carried it to the machines like a responsible adult, and somewhere between the hamper and the drawer, the laundry quietly robbed you.
Pairs went in. Singles came out.
Not both socks gone, which would at least be tidy. No, the laundry is more creative than that. It takes exactly one sock, always the good one, and leaves its partner behind as evidence. Now that partner lives in a special drawer purgatory with eleven other lonely socks, each a slightly different shade of black, none of them matching, all of them waiting for a reunion that is never coming.
You keep them, of course. Everyone keeps them. Throwing away the survivor feels like giving up, and what if the missing sock turns up? It will not turn up. You know it will not turn up. You have moved apartments since that sock vanished. And yet the drawer of singles grows, season after season, like a tiny fabric support group.
Then comes the forensic phase. You check inside the washer drum. You check the rubber seal, that flappy grey hiding spot where socks go to contemplate their choices. You shake out every pillowcase and fitted sheet, because a sock can absolutely hide in a fitted sheet and survive an entire wash and dry cycle in there, emerging smug and slightly damp. You look behind the machines, in that dusty no-go zone of dropped hangers and mysterious lint, and find nothing but old detergent caps.
The theories are endless because the truth is unbearable. Static cling attached it to a towel you folded and put away in a closet in another room. It slipped into the sleeve of a sweatshirt and is now living a double life. The dryer vent is involved somehow. Your dog is involved somehow. At some point every adult has stood in a quiet laundry room, holding one warm sock, and seriously considered that the machine simply ate it, the way you might eat one fry out of someone else's bag and say nothing.
So you adapt, because adulthood is mostly adapting to small defeats. You wear mismatched socks and call it personality. You buy twelve identical pairs in bulk, a genuinely smart system, and the laundry responds by losing six rights and no lefts, which should be statistically adorable and is instead infuriating. You start a fresh bag for orphans. The bag gets its own bag.
Here is the honest ending nobody wants: there is no solving this. There is only folding what came back, pairing what can be paired, and performing the small, hopeful ritual of checking the single-sock drawer one more time, just in case, before you get dressed in the dark and discover, by feel, that today you are wearing one navy sock and one black one.
Again.