LOVE: Refreshing Button
Here's one that IT admins will absolutely hate when invoked accidentally by users, but parents will love it if their kids inevitably end up sapping Windows performance on machines they use to surf the Web. From the General tab of the PC Settings panel, Windows 8 offers the ability to "refresh your PC without affecting files." This process resets Windows to its factory state while leaving user data alone. Apps remain as well, but only those installed from the Windows store. Anything that runs in Desktop mode will be wiped away, leaving IT with a new set of re-installation chores.