Word Games & Puzzles - Lateral Thinking
3. Three switches outside a windowless room are
connected to three light bulbs inside the room. How can you
determine which switch is connected to which bulb if you are
only allowed to enter the room once?
Switch on the first switch, leave it
for a minute, and then switch it off again. Then switch on the
second switch and enter the room. The second switch will be
connected to the light that is on, the first switch will be
connected to the light with the warm bulb, and the third switch
will be connected to the light with the cold bulb.