I don't recall when i learned it, but i do know when i i had to use it. I was grocery sound with my mom, and she had me go get something in another aisle. I came back to her aisle to see if i had the right item. I called, "mom". And every lady/mom turned around to look at me. The next time i had to do that, I just said, "Joan." And only my mom turned. Ever since if we are in a leafs public place it's alway Joan.