It's witty, but I wouldn't say funny.
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How did Bob know his exact velocity?
the point is that his position was infinitely uncertain...
Manny Mandelbrot was upset because the other fractals wouldn't play with him... They said he was too self-similar. He decided to play hide and seek with Bob the electron... He couldn't ever find Bob because Bob always told Manny his exact velocity.
Very bad jokes, but funny... and yes, i know that most fractals are more self-similar than the mandelbrot set... it just makes a good joke