"Russian professor and his flea experiment" joke

A great Russian scientist Ivan Ivanowich Ivanow made experiments with a flea.
He said: "Jump, flea!" and it jumped 40 centimetres high.
So he took a pencil (a big Russian invention) and put the following record in the experimental log: "I said:' Jump, flea!' and it jumped 40 cm."
Then he tore off one of the flea's legs. He said: "Jump, flea!" and it jumped 30 centimetres high. He recorded: "When I tore off one leg, the flea jumped 30 cm."
Then he continued tearing off other legs and the flea jumped 20, 10, and 2 centimeters high, respectively. Everything was recorded in the log book.
When only 1 leg remained, the poor flea jumped only 1 millimeter and a half high. Again, it was recorded.
Finally he tore off the last leg. He said: "Jump, flea!". No response.
He said again (in a high voice): "Jump, flea!". Nothing.
He shouted: "Jump, flea!!!". The flea did not move.
So Ivan Ivanowich Ivanow took a pencil for the last time and wrote: "I tore off all flea's legs and it cannot hear."

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