Picking out the "Monster's ring" you try it on your finger. It's black and elaborately carved but you feel it's just not you. You quickly take it off - or try to, but you find the ring is stuck on your finger and won't come off! Well, you'll have to buy it now!
You walk out of the shop, still fiddling with it. If you can ever get it off you might be able to sell it on e-bay...