RIDDLE ME THIS:


In a room, there is 1 lightbulb. There is 1 and ONLY 1 door getting into the room and once you have gone in the door you must close it behind you and may not go back out. Outside the door there are 3 light switches.Once you open the door you CAN'T touch the light switches any more Only 1 switch turns the light on. How do you figure out which switch turns the light on.