A gorilla walked into a drugstore and ordered a $1.50 chocolate sundae. He put a ten-dollar bill on the counter to pay for it.

The clerk thought, what could a gorilla know about money? So he gave the gorilla a single dollar bill in change. As he did, the clerk said, "You know, we don't get too many gorillas in here."

"No wonder," the gorilla replied, "at nine dollars a sundae."