What do you do when someone knows you, but you don't recognize them?

What do you do when someone knows you, but you dont recognize them?

They approach you out in the street, know your name, ask how you are doing and maybe ask about your spouse and kids too. They seemingly know everything about you, but all you can do is smile, be polite and try to remember who the are because you can't remember for the life of you.

To me it happens somewhat often, and usually I end up remembering. It happened with my half-sister too, I did know she existed, but I had seen her just a couple of times over the years so I didn't recognize her. She noticed this, because she even said "You don't know who I am, do you", but she wasn't angry about it, more amused than anything else.

What do you do when someone knows you, but you don't recognize them?
Post Opinion