I like to have themes installed & windows update (which 99% of people will not be able to figure out how to fully stop) always breaks my computer requiring me to roll back to the previous update until I get another update notification which force-ably breaks my computer again. I now use Sledgehammer 2.6.0 to absolutely crush windows' update attempts every time I boot up. Microsoft deserves hate for not giving users simple permissions over their own systems.
Vegetarians get B12 from the animal products created from animals which supplemented B12. Everyone is supplementing B12 regardless of their diet, it's just a matter of how many steps removed from the supplement that people seem to think makes a difference (it doesn't).