Top ten off switches

#10 - The kill switch
This is the big daddy of all off switches. If you press this monster, you'd better expect everything to go dark, because this switch is all about killing all the power within a 5-mile radius. Well, at least the power to the Underground track mere meters away.

This glorious off switch lives in Southwark underground station on the Jubilee line and we've been thinking about it ever since we first set eyes on it. Notice how vibrant the red is on the button, how smooth the finish is and how the button is exactly the right size. You'll also notice the red light, which we assume will illuminate if the button were ever to be pressed. We can only dream.

Update: Thanks Martin, you stripped away all the mystery of our favourite switch by pointing out that it is, in fact, a power socket. Hmph. Whatever.