Concepts, sayings, and objects that make little or no sense.

There are common concepts, sayings and objects that we take for granted that actually make little or no sense.
For example:
"A watched pot never boils."
Of course they don't. But the water does... eventually.
"Vacuum cleaners are a housekeepers best friend."
No they're not. First of all, houses are not vacuums, and secondly, vacuums are not dirty.
Others?
"It's a sad and beautiful world"
-Roberto Benigni
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Comments
An old southern guy used to love to use this analogy. I've never understood it...
It must be one of those kinky a... I'd better stop right there.