A scientist examines a frog cuts him a leg and tells him:
- Jumped up !
And the frog jumped.
The scientist cut off his second leg and said:
- Jumped up !
And the frog jumped.
The scientist cuts off his third leg and asks him to jump
And the frog jumped,
So he cuts off his last paw and says to him:
- Jumped up !
But the frog does not take off this time.
Morality of the story: when you cut four legs to a frog, it becomes deaf!