A
scientist is doing an experiment on a
frog. He puts the
frog down on the table and says "Hop."
The frog hops.
The scientist then cuts off one of the frog's legs and says "Hop."
The frog hops.
The scientist then cuts off another one of the frog's legs and says again, "Hop."
The frog staggers about for a second but manages to hop.
The scientist then cuts off both the remaining legs of the frog and says "Hop."
The frog, not surprisingly, just sits there.
The scientist makes a notation in his book: Frogs with no legs become deaf.