Okay, so you know how they're basically two kinds of urinals? One's the porcelain bowl thing and the other can only be described as a big long metal pissing wall.

Without getting into too much icky detail about urination, I hate the metal wall. I don't know if it's just me, but I usually get a bit of splashback with the wall, no matter what the angle. Nothing could be more annoying or disgusting for a guy who is always either wearing thongs/flip-flops or a pair of good sneakers. What society really needs is for the metal wall to become a thing of the past for all public restrooms, but failing that, I'm thinking a foot/shoe guard installed across the length of the wall would be a great invention.