I haven’t read the thread so someone might have told this one.

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A biologist was doing an experiment that involved training fleas. Whenever he said “Jump!”, the flea had to leap as far as possible.

For the first experiment, he called out, “Jump!” The flea performed a graceful 30cm leap, and the biologist wrote down the figure in his notebook.

He then removed two of its legs, and commanded it to jump once more. This time it only managed 18cm. Two legs less, and the jump length dropped to 5cm.

Finally, he removed its two remaining legs, and said, “Jump!”. The flea stayed put. The biologist pondered this result for a moment before writing down his conclusion: Fleas with no legs are deaf.

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And another one, courtesy of comedian Bill Bailey (he can have the BP if he wants them!)

Three men walk into a bar. One of them is a little bit stupid. The scene unfolds with tedious predictability.