I got some pretty cool bluetooth earbuds last month. They come with these great ear guards. But, sometimes with my eyesight what it is, it's hard to tell which is left or right. I used to spend about 30 seconds a day trying to get it right.
So, I just used a couple inches of yarn to identify my right site. I flip the cord around to behind my head and I am set. A simple fix for a simple problem!