The nautical terms "port and starboard" refer to the left and right side of a vessel when looking from the stern to the bow. At first it seems silly, but, it's actually great to unambiguously refer to a side of the boat, whatever your orientation or point of view is.
A million times I've heard "there is a stain in the left corner of your mouth. No, your other left". I'm pretty sure "left" means left for the person with the stain. But, it leads to eternal confusion!
I wonder if there are languages out there that have this resolved.