Fish Heads

A blonde went to “Jim’s Seafood Store” and asked the owner what was the best part of the fish.
Jim smirked and said, “The best part of the fish is the head. Not only is it good, but the head will make you smarter too.”
The blonde decided to trust his recommendation. She bought one for $4.34 and went home.
Later that week, she got some more. For about three weeks, she got fish heads.
Then one day, when she came in, she said, “You know what I have been thinking? It’s silly that I buy fish heads for $4.34 each when I could have the whole fish with the head for $3.00.”
Jim smirked again and said, “You see, you’ve got smarter already.”