A long time ago, I used to paint murals for a living.  I have painted a small design on one wall of our classroom.  Today, a student was examining it...

Kendra:  Mrs. B, will you paint dolphins on the wall of my bedroom if I steal my parents' credit card and give it to you?

Mrs. B:  That's not really a good idea.  I don't think your parents would be too happy about it.

Kendra:  They'll never know.  They have lots of credit cards.

(Note to self:  Find a way to subtly warn Kendra's parents about hiding their wallets...)