Agreed Greg, furthermore, the image of a bowling ball resting on a tennis racket (as opposed to a tennis ball) is used to describe a super-dense object's effects on gravity. One such object would be a black hole.
I am not fully swung by your interpretation but I am certainly more in favour of it than the toilet humour...
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From: Greg Jenkins <grsjenkins at yahoo.com>
*The tennis racket that BB1 mentions is a common depiction of the
space-time continuum, a grid of "space" upon which rests a ball.
This graphical construct has been used countless times to try to aid
understanding of the mechanism of gravity.
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