You might already be being hounded by Microsoft notifications to install Windows 10 on your PC, but some users are reporting the OS downloading itself on their machines without permission.
Imagine playing one of the titles in our list of PC's best games, only for Windows 10 to be quietly preparing for install in the background.
There's a big old Reddit thread full of people who have been affected by this automatic install, with some claiming they were never even warned at all, while others say they didn't notice the warning message.
"Yep this happened to me this morning," says 'geekygirlhere'. "Working and all of a sudden Windows closed all my programs, logged me out and started the upgrade. I quickly shut down my computer and was able to stop it but my son wasn't so lucky.
"Same thing happened to him today. It is very concerning that they have this kind of access to push these updates without our consent. What else is being pushed through our computers or being pulled off in the background without us knowing?"
It's seemingly happening because Windows 10 is categorised as a "Recommended Update', giving your machine permission to install it when it fancies, really.
In some extreme cases, people are reporting the upgrade taking place without them realising, only for them to get to a login page that's asking for a password they set years ago and no longer remember. This obviously means they can't get into their computer, never mind rolling back to a previous OS. Oops.
Have you had any issues with Windows 10 trying to sneak its way onto your PC? Let us know in the comments.