The weirdest thing happened to me about 20 years ago.
I was visiting my parents. And while waiting for the bus an old woman approaches me and asks me if I belong to the family of X (my great-grandfather).
"I do indeed!"
"You must be the youngest of the grandchildren then."
"I'm actually one of the great-grandfathers. I'm the grandchild of his daughter Y."
"Oh, I see! And how is he doing?"
"Well, he died. Like 6 or 8 years ago."
"So bad. I did not know it. Well, I've been living abroad for the last 50 years, that's why."
"Oh. I see..."
"Yes."
"And... how on earth did you recognize me?"
"Oh, that was easy, you look exactly like his mother when she was young."
Apparently I look exactly like my great-great-grandmother, of which there is only one photo and she was already an elder woman.