Top ten off switches

#9 - The unswitchable switch
This is an off switch that is very close to our hearts, because it's in our very own data centre. What makes this switch unique is that it can't be turned off. Ever. Due to a misunderstanding with a contractor, the protective case that surrounds it is totally sealed.

While this does a good job of protecting the switch from accidental activation, it could also create a problem when there's a situation that requires the power to be swiftly cut. Still, the main fuse box isn't very far away.