As it is Christmas, here's a little puzzle to get the little grey cells in your brain working.
Study this diagram carefully.
There are two rooms side by side in a corridor. Room A and Room B.
You are in Room A. You cannot see Room B or what is in it.
Room A has three electric switches on a table - switch 1, switch 2 and 3.
Each switch connects to a light bulb in Room B. But you do not know which switch connects to which light bulb.
Your mission, should you choose to accept it, is to identify which switch connects to which light bulb.
You are only allowed to visit Room B ONCE only. That is the time when you identify which light bulb connects to its correct switch.
Once you leave Room A you cannot go back there - you have to go to Room B to identify the light bulbs.
How do you do it?
Answers in the comments box below. Thanx. Happy thinking.
P.S. I'll post the answer in the comments box shortly. Good luck!