Sad but true
I used to live near the beach and went frequently. One day, I wasnt able to go to the nude beach so opted for a beach nearer that I new was also not overly crowded. Got to the beach, set up my chair, umbrella and was wearing a tan-thru suit. (If you have never seen them they all have patterns so you can not see what is underneath but lets sun through actuating like an SPF10 and allowing an overall tan)
As I sat there enjoying the sun and sound of the crashing waves, no one else around, I saw a couple walking along the shore. I was about 25 feet from shore and they were walking just near the waves crashed. The nearer they got to me the more they kept looking up to me, and I swear were talking about me even after they passed they would look back at me. As they disappeared down the shore, I found myself getting angry at what I thought was rude behavior. So much so that if they continued to look at me on their return trip I was going to walk down and say something.
As I sat there I decided I needed more suntan oil on my legs and then I realized the 1/2 metal cock ring I was wearing was reflecting the sunlight through my suit!!!!
I didnt say anything as they walked by later.