I remember being told that when you pull off the pop can pull tab you wear it on your finger and use it as a nose picker! Some were flat, some curled. I would sit and look at them on my finger and try to imagine why I would use that to pick my nose! I often bent them down so they looked like a real ring and I could put my hand in my pocket. In the '80s the pull tab was replaced with the flip tab, where you couldn't pull them out!
I hadn't seen one of those pull tabs in ages until I was hiking around Chilco Lake with my husband. I was on the trail behind him and stopped to look at the small lake from the rock I was on. I looked down at my feet and there was a NOSE PICKER RING!! I admired it, didn't move it, didn't touch it but captured it with my lens. It has been there almost 30 years, and it is still there today.