there is a corridor that leads into an empty room. the room is completely empty
except for a lamp in one of the corners. on the other side of the corridor are 3
switches. you know that one of them turns on the lamp, the other 2 dont do anything.
you can play around with the switches turning each of them on and off as much as you like,
then you can go into the room 1 (one!!) time to check whether the lamp is on or off
(there is a door so you cant know without entering the room).
leaving the room, you have to know which of the 3 switches works and which 2 dont.
'When I want your opinion, I'll beat it out of you.' --- 37% of Americans agree that while they would hate being British, they wouldn't mind having a British accent. --- Ever stop to think, and forget to start again?