We have three pins cos one of them is the earth to give a bit of protection.
A lot of appliances may have a three pin plug, but the earth pin isn't connected to anything, its just there to open the gate in the socket.
In Saudi for instance they use two pin sockets, with no earth, and no gate to prevent an inquisitive 6 year old sticking the break cable from his bmx into it just to see what would happen
PS what happens is one of your fingers goes knumb and "mum's gonna kill me" goes through your head
