Not a word, but a phrase:
"Watch out for the left bear"
I was driving, for the first time, in the UK and totally lost. It was in the countryside somewhere around Oxford. I finally stopped and asked a guy for directions. His English was barely intelligible to me, I understood the words in the phrase, but it took a while to translate. My first thoughts were I didn't know they had bears in the UK, and what in the world was a left bear? Some kind of grizzly?
Never was sure I fully understood, but there was a fork in the road and the right way to go was to the right...
I did finally get to my destination, and without running into a single car driving on the wrong side of the road. It was a long stressful process.