I think I've told this story somewhere on here before, but I won't bother going to look for it....
In the summer after I finished my graduate studies, I was trying to find a job, and this meant lots of phone calls. I'd been away for school, then moved back into my parents' home while I searched, because I was looking all over the US and didn't want to get established somewhere only to have to move again when I found my dream job. Meanwhile, my parents changed their internet/phone provider, and my mother kept complaining about line noise, and poor quality calls. So when I was trying to coordinate interviews and actually conducting phone-based interviews for some jobs, I attributed my inability to hear the other end to the "line noise". It turns out, my mother was complaining about something incredibly trivial, and in my case, I had a brain tumor impinging on my 8th cranial nerve. I discovered this a week after I started my job as an administrative law judge, where I'd be conducting administrative appeals primarily over the phone. Shakespeare wrote my life.
Anyway, I joined an online support group, researched, had surgery, made some friends, etc. Everything turned out okay in the end (except I am still half deaf... nerve damage doesn't usually get better).
Nearly ten years later, I was still in contact with one of my "tumor people" friends, and after more than a few mutual exchanges on his Facebook posts, the friend suggested I add his son ("Ah-hah! So that's who that guy is!") as a friend because he thought we'd have a lot to talk about. So I added him. At first, I thought he had a very serious but long-distance girlfriend (because she friended me right after I added my now-husband and asked how I knew him and told me that they were in a very serious long-distance relationship... I didn't really know him, so I believed her), so I was friendly but didn't get too friendly, if you know what I mean. Anyway, eventually, he found out she'd told me that, we all cleared the air, they are no longer friends (in fact, my now-husband isn't even on Facebook anymore), and he and I ended up married and living in England (now Wales). Whee!
Edited to add: I chose to move to him, rather than the other way around, because he was employed, and by then, I was living a very frugal life on a pension and didn't need to be based in any particular location. But looking at cost of living, and the employment market, more than once (in the early days), I would think how much easier it would be if we lived in the US. But, for political reasons, I'm glad we're over here now.
