This picture was sent in by PL. He writes: "This is from Casey Moore's, in Tempe, AZ. They style themselves as an Irish Oyster Bar, but are mostly known for being a great place to hang out and have a beer. This is popularly referred to as "the pissing wall." It's located on the outside patio, behind a fence. It even includes a sink and paper-towel dispenser. You wanted unique, well here it is!"
Reader TB writes in with the following comment: "The picture of the Urinal at Casey Moore’s is not “the pissing stone” as someone has listed it. They call it “The Blarney Stone”."