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I really like the inverted version, where it's almost guaranteed to splash yourself as a deterrent.

There are historical examples of this in some alleys in central London (https://www.exploringgb.co.uk/blog/9th-century-urine-deflect...).

I remember being unpleasantly surprised by one after a particularly heavy New Year's as a student.

> The “urine-no,” a hostile antiurination surface