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I once had a coworker message me out of the blue asking if I'd be available to chat later that day. I said sure, thinking he'd follow up with the topic of the chat, but he just sent me a non-descriptive calendar invite. I didn't want to sound paranoid so I didn't ask (I should have), but in my head I was racking my brain for any possible reason he could want to talk to me one-on-one. I was pretty new to the company at the time so I was worried I'd done something wrong, but I couldn't think of anything so serious that he would need to schedule a chat about it and also he wasn't really my superior so that would have been really strange. I decided to just try not to worry about it.

In the end, it turned out he was leaving the company and wanted to tell his fellow engineers one by one. It was sweet and the secretiveness made sense in that context, but it did leave me a bit spooked.

Conversely, during a one-on-one my supervisor ended our small talk with, "So I have something a bit more serious that I want to talk about..." immediately followed by, "--it's nothing bad!" So luckily he was a bit better about not being spooky. Turned out they were promoting me.