"I must say that of all the rings I've made over the years, yours has to be the most unusual," said the wizard.
Casper asked. "Just so I'm sure, I'm not going to be mugged by self-righteous magical tough-guys for using this am I?"
"The rules of conduct for a ring are simple. As long as you don't try to crown yourself king of the world, President For Life Of the United States, or the like, you could turn the human race into anthropomorphic ant-eaters who all love polka and the Forces That Be will fine with it."
"What about the magical sensitive self-righteous tough guys?"
"Here's a card for a lawyer friend of mine if that happens if you get assaulted by the self-righteous types who like to hear themselves talk. Don't worry, he's not a demon or anything."
"So this ring will do everything?"
"Mostly everything. I have to keep some features out, can't have one ring be able to do EVERYTHING. Keeps things from being boring if you have RULES you need to follow."
"I don't suppose I could order another?"
"One ring per-customer, that's my store policy. No exceptions. You'll never find this store again. The ring is a part of your world once you step outside."
"Alright. Guess this is it."
"Good luck. Just don't count on that ring itself bringing you happiness, they never do."
"I figured. See ya."
Casper stepped out of the store, which was gone by the time he looked back. He had spent a large percentage of his life savings on the little ring, the wizard said the ring cost how much he wanted it, and Casper admitted when the wizard said he could make customizable rings, he wanted it badly.
He knew a friend and his girlfriend, who had to the store, and had become a cheerleader and a football player respectively thanks to the store's various trinkets.
But the rings were the big ones, only sold to a handful of people, the wizard said he 'these things WANT to used, remember that.'
Casper walked across the hall of the indoor mall to a small coffee shop. He looked at the girl behind the counter and used the ring of the first time.
A second later she was a mostly naked, green and yellow rubber anthro lizard with a barcode on her butt and she was mostly filled with air. She still wore her name tag and apron ironically, they were store policy after all, but he could guess she didn't wear clothes in her off hours.
"Have a nice day." She smiled and she handed him his change.