No Thank You, Evil!, the Cipher System game for children, has several of these:
Muttropolis, a city run by dogs; most of the humans there are pets, and act like real-world dogs do, rolling around and playing fetch. So it's a fun exchange, right? Well, it would be if the backstory didn't include a regular human from the outside, used to being a regular human, wandering into Muttropolis and being forced to become a dog's pet and, presumably, act like one.
The Mini Mall, a mall shrunk to the size of a man's foot by an evil wizard. A good wizard installed a magical escalator which can get regular-sized people in, and they can escape by interacting with something they have which used to be regular-sized. But the people who were in the mall when it was shrunk? They're trapped forever, and the mall is actively described as being overgrown, derelict, full of mysterious unknown robots, and none of the shop titles make sense because people there are going mad.
Dungeons and Dragons: creatures in Real Life have spines in their backs to protect them from being eaten by bigger, scarier creatures. However, in D&D, the Tarrasque has spines.