Procedure Have one person fill each of the plastic eggs with a different item.
Put some rice in one, some dried beans in another, etc. Keep track of what you put in each egg by writing numbers on the egg. Have a different person try to see if they can figure out what is inside each egg by shaking and listening to the sound generated. After taking a first guess, now show the person the list of what items are in each egg and have them guess again. See if the person changes their mind about some of the previous guesses.