This definitely happened to me a while ago. I'm not that upset about it, except that I spent some time changing all my local accounts from "jon" to "jrockway", and signing in with my email address made my local account "jon". Now when I ssh places, I have to supply -l or properly add an entry to ~/.ssh/config because this is the only account I have that's not named "jrockway". All in all, this reduces the enjoyment in my life by 0.0000000000000001% but I'm not losing too much sleep over it.
(My favorite Windows 10 update was the one where you installed it, and instead of getting your desktop on reboot, there was this weird slideshow that said "HELLO" "ALL YOUR FILES ARE EXACTLY WHERE YOU LEFT THEM". I thought it was malware, but that's apparently something a large team of experts at Microsoft thought would be fun for their users. Maybe they were really excited about some filesystem bug that they fixed? I'll never understand.)