Urine Deflectors in Fleet Street of the Early 1800s
catsmeatshop.blogspot.com
catsmeatshop.blogspot.com
http://www.irishexaminer.com/ireland/shops-shock-and-awe-pla...
QED via Mythbusters
Either way, I assume - crucially for the shop owner - most backed-up, drunken revellers would be unaware of this :)