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I do the same! Using it for non-serious things just adds an extra level of irony. Funniest example I saw was "This is not a place of honor" on the back of some booty shorts

Human nature: the best way to convince someone that there is something valuable here is to put up a sign that says “nothing valuable here—go away!”

My best idea yet for the signs around a dangerous waste depot:

Just put up a sign that says “no cash kept on premises” and an empty cash tray on a counter, behind some glass sliding doors.

I had it stitched into a pillow. It makes me very happy every time I see it.