Many years ago, as I'd entered a supermarket not so far away, a woman approached me, called me "cousin," and asked me to tell the nice security guard that she was with me (and, a few spare dollars would be nice).
Seems said guard had been trying to persuade her to leave the store.
(Thing is, we did look like we we could be related ... but all of my relatives are at least a thousand miles away.)
Of course, I told the nice security guard that I was not her cousin and, in fact, she was a complete stranger. She was escorted from the store.