Smart people do this when their computer comes with an inferior operating system, especially Windows 8.
Matt: Hey Aidan, I got this totally awesome new laptop! It's got an Intel Core i7 quad-core, dual Nvidia graphics and 12GB of memory!
Aidan: What operating system does it have? Windows 8?
Matt: Yep, so I'm gonna be upgrading to Windows 7!
Aidan: Then we can play Borderlands!