The best scientific joke (On creating conclusions)

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I have been struggling with some equations, nonetheless,
there is no other way to cheer me up than having a laugh.
Arguably, this is one the best scientific jokes, to the best
of my knowledge and belief, that every time that springs
to my mind, it, literally, makes me laugh a lot. As you might
know, there are different version as a result of this, I have
just posted three versions. :)
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# VERSION 1

There is an story of the old professor-zoologist who described
his work on locomotion in fleas; he fished out a flea from
his box, placed it on the lecture-table and yelled at it,
“jump”, and the flea did jump. The professor then
removed the legs of the flea, one by one, and then shouted
again “jump”; but the flea did not jump, whereupon the
professor announced his discovery that “the flea hears
through its legs”. His observation that the flea without its
legs did not jump is acceptable as valid, but not his
conclusion that the flea hears through its legs, as the flea
does not have a hearing-organ. He apparently was not
aware that a flea will respond to vibrations that his yell
“Jump” would have caused, and his conclusion was
therefore bedevilled by his ignorance of the fact that the
flea has no ears but is sensitive to vibrations. This
illustrates another requirement for valid conclusions, that
of awareness of the valid facts that have already been
discovered through proper scientific methodology, i.e.
familiarity with the scientific literature [1].



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# VERSION 2


A biology professor trained a flea for many months.
He was able to get a response from the flea each time
when the command was given. The professor shouted the
command “Jump” and the flea leaped into the air.
The professor decided to determine the location of hearing receptor.
Professor removed the legs of the flea one at a time.
The flea continued to leap on his command “Jump”. But as each
successive leg was removed, his jump became less spectacular.
Finally, with the removal of the last leg of flea, the flea did not
response to the command “Jump” and the flea remained motionless.

Conclusion

“When the legs of a flea are removed, the flea can no longer hear.
Therefore, the locations of hearing receptors are in legs. [2]”




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# VERSION 3

There once was a scientist. He majored in fleas.
(A flea is a six legged bug that sucks blood from other living animals.)
He decided to do an experiment one day.
The scientist placed a flea in a covered environment. (Jar)
The scientist commanded the flea to jump. It jumped. ( That's what fleas do.)
The scientist pulled one leg from the flea, and commanded the flea to jump. It jumped.
The scientist pulled another leg from the flea, and again commanded the flea to jump. It jumped.
The scientist continued this until the flea had only one leg left, and still, it jumped.

The scientist then pulled the last leg off of the flea. He commanded the flea to jump..... nothing.
Again, he commanded the flea to jump. Still nothing. The flea would not jump.

The scientist's conclusion:
If you pull all of the legs off of a flea, it can no longer hear [3].


References
[1] http://www.sljol.info/index.php/AMJ/article/download/6138/4801
[2] http://www.ift.org/~/media/Knowledge%20Center/Publications/ManuscriptPrepGuidance1009.ppt
[3] http://www.bubblews.com/news/1585633-the-deaf-flea