Fierce Metal Dinosaur
With spiky teeth, snakelike tongue, and an angry expression, a giant metal monster guards a porta-potty outside an Arizona antiques store. "Customers only, rarragh!" There are other, smaller metal dinosaurs farther back in the lot, as well as more typical Southwestern antelope, cowboys on horseback, cacti, etc. They all appear to be made by the same artist, from the same dark brown metal, by welding pieces together to create a kind of Frankenstein's monster look.
Depending on one's constitution, the monster's menacing presence could be either an aid or impediment to speedy elimination.