A T-shirt I should've bought when I had the chance

"The best way to keep children home is to make the home atmosphere pleasant--and let the air out of the tires." - Dorothy Parker

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"Not everything is Flat in Holland"

A variant reads: "Not everything in Holland is Flat"

My favourite version of this (in Eindhoven airport) had 2 concentric crescents behind the words.

This T-shirt design also pops up in other places: