Instructions

1 - Take one piece of string and tie it to one corner of the oven shelf. Do the same with the other piece of string on an adjacent corner. If you hold onto the loose ends of the string, it should hang like a picture on a wall.

2 - Take the loose ends of the string and wrap one round each of your index fingers. As your friend to hit the oven shelf with the wooden spoon. What does it sound like? 3 - Put your fingers in your ears. The oven shelf should now be hanging down directly in front of you, as though you're hanging a picture from your eardrums!

4 - Ask your friend to run the wooden spoon across the front of the oven shelf while it's hanging from your ears. What do you hear now?

5 - Let your friend have a go!