This isn't the weirdest thing that's ever happened to me but it happened today and I was wondering who I could tell that would believe me, and here you all are 
You have to go back about six months to when I thought perhaps I recognised a new guy at work as someone I follow on Twitter (whom I'd never met). The chap on Twitter has his CV as part of his bio, so I went and checked and no, he's not working where I work, must just be someone who coincidentally happens to resemble this guy's Twitter profile picture.
But today they've put up the team's names next to their photos on the wall (we work on different teams; I've never spoken to him) and well, he doesn't just look like this guy, he also has the same name! So I go back and have another look at his CV and yes, he's now updated it and we do work together. Hmm, I think, I'll have to mention it to him next time I see him.
This evening I leave work and take a train about eight miles, which is two miles short of where I'm headed but I want to get my 10K steps for the day. As I'm walking down a quiet residential street nowhere near my office or my home, who should come along from the other direction but this chap! I'm now worried about mentioning any of it to him in case he thinks I'm a stalker!
(He can't be stalking me; he'd have had no way of knowing where I was going this evening
)
So not spooky or creepy, but a very unlikely coincidence.