Any of the date hats "Bûche de Noël" or "Where in the World?" or the Kitsune, if the post is closed. And we can't be sure there's not another secret hat, right? Something like the "Universe Brain", "Cosmic Brain" or "Red Baron" from 2019 :)
The description for Backlog says "Answer a question from 2019 or earlier that does not have any answers. Both question and answer must have a positive score.", but I think someone in chat said it had to be older than 1y exactly (eg. late Dec 2019 doesn't count)
I enabled dark mode on Stack Overflow yesterday, disabled it, and I still don't have flashlight. Is there a requirement such as having it enabled for a certain amount of time?
I've got the Vexillologist hat, then removed. But as I was wearing it, no one dared to take it from vinnie jones. If I change to another hat, will that mean this hat to dissapear forever from my profile?