Colin: Mommy, look!
Mommy: You found a dollar.
Mommy: What would you like to buy with it?
Colin: A doughnut.
Colin: You know, if you don't want that you could take it to the store and give it to the lady and she will give you money for it.
Colin: Mommy, do you have any money?
Mommy: Yes, I have some money. Do you need to buy something?
Colin: No, I'm too little for money.
(I can't believe that at 2 years old, Colin has already grasped the concept of how money works!)