My favorite is Microsofts fucked up idea that windows updates should be done as the default when you shut down. Its like they never considered that when I'm shutting down my laptop to carry it to the next place I have to go, I might not be in a little bit more of a hurry than waiting 10 minutes for windows to install its security patches.

I quickly learned to never shut down the computer unless I have lots of time or unless the system crashes and there is no choice (but then of course windows wont install its updates).