If someone's attitude, etc. is really pissing me off, I say something acknowledging their "continued predilection for irrelevancy."
I use this one on my father a lot. Not being a Trek/sci-fi fan, he sure as Hell doesn't get it.
It was even funnier when I was saying this in 1979 at 12-years-old.
Point at your trouser front and say "It knows only that it needs."
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