Identify one of your earphones with an old cap
Sometimes earphones need to be changed since one of the silicone caps might have fallen and gotten lost. Without one of the caps, both earphones can no longer be used because the one missing the cap will no longer fit into the owner’s ear. Moreover, it might be dangerous.
This person has saved an old cap that merely differs in color from their new earphones cap. In this way, the owner will not only be recycling the parts that are not broken, but they can now also identify which earpiece goes in which ear. They will not waste time setting up their earphones anymore.