There are two rooms. One with 3 light switches, the other with three light bulbs switched off.

You must find out which switches correspond to which bulbs. You may only enter the room with the bulbs once.

How do you find out?

turn on first switch and leave it on

turn on second switch for a couple of minutes and then turn it off and run in the bulb room and feel the 2 bulbs which are off.. and the one which is warmer is the one controlled by the second switch

Ahhhh you heard it before.

Do you know the answer to the other too or are you going to have a legitimate go at it?

No I hadn't heard this one before!

I have heard the other riddle before though lol