Flea Market
A prominent scientist conducted a very important experiment. He trained a flea to jump upon giving it a verbal command ("Jump!").
In the first stage of the experiment he removed one of the flea's legs, told it to jump, and the flea jumped. So he wrote in his scientific notebook: "Upon removing one leg, all flea organs function properly."
So, he removed the second leg, asked the flea to jump, it obeyed, so he wrote again: "Upon removing the second leg, all flea organs function properly."
Then he removed the last leg, told the flea to jump, and nothing happened.
He did not want to take a chance, so he repeated the experiment several times, and the legless flea never jumped. So he wrote the conclusion: "Upon removing the last leg, the flea loses all sense of hearing."