She sees old man selling apple seeds for $5 a piece, so she asks why these seeds so expensive, to which old man replies that the seeds make you smarter if you eat them.
So blonde buys 5 seeds and eats them, than thinks for a moment and says: I could have bought 5 pounds of apples for that price.
Old man replies: see, you are already smarter.
Blonde: OK, give me 5 more.
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