Yes we can tell L from R but when one is in a hurry it's nice to just grab them and pop them in your ears.
My brother came up with the idea of putting odd coloured ear bud covers on his iPod ear buds. The rubber around the speaker detiorates with time so the covers mean you don't have to throw them away, you can keep on using them. After my own odd coloured set wore out I was only able to get a pack of all black pairs from Dick Smith. Ear bud foam covers are really hard to find!
If you have ever got biro or permanent marker on something vinyl or rubber you know that even if you clean off the surface ink it penetrates into the material. This 'life hack' takes advantage of that.
You will need
a small point, permanent marker
Carefully draw a line around on the end of one bud's stem. Leave for about 5 days or up to a week for best results. The colour will start to bleed a little into the rubber.
Swab off all the surface ink you can to reveal a permanent tattoo.