I have if the water was running. Piss is generally sterile so I've never felt it was that big a deal.
As for asking for strange places I have gone, it'd probably be easier for me to list the places I haven't taken a piss on. Worst I've likely done is piss in the water tank of a cabin owned by someone I've never been too fond of. To be fair though, the guy *did* claim to kill one of my pets who was like a best friend to me (he never liked me, but that was going too far). And I've done much worse to the guy...
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