A lady lost her purse in a bustling department store. She searched everywhere she had visited, but just couldn't find it.

Finally, a little boy approached her and asked, "Ma'am, is this your purse?"

Jubilantly, she grabbed the purse and cried, "Yes! Yes, it is! Thank you so much!"

Then she looked inside and was suddenly confused. "But how strange... when I lost it, I had only a hundred dollar bill, but now I have five twenties!"

The boy replied, "That's because the last time I returned a lady's purse, she didn't have any change for a reward!"