Why Do We Always Do Things We Are Told Not To Do?

for instance on a wall there is a big red button that beneath is says, 'Do Not Push the Big Red Button',

 well for me looking over my shoulder to make sure no one was watching naturally I would push it, so when you go to an art gallery featuring a ceramic skull by Norwegian artist Erik Pirolt and under it there is a sign that says 'do not look into the eyes' naturally you do,

and receive a jet of water, most people act surprised, some just over react.