I picked two bottle caps from a bin at walmart once and tried it. I found it wholly unsatisfying. others have done the same with the same result.
As far as “fidgets” go, I think fidget spinners are far superior to two bottle caps. You can spin them from the center, or from one radius, you can spin them all sorts of ways, there are a variety of textures, colors, lights, speakers and edges, and they make a pleasing sound when they are perfectly balanced.