I’m visiting my upstairs neighbor, who’s in the process of moving, to help him with some condo-related paperwork. He opens the door for me; I say hello, walk in, and turn around to close the door behind me. As I turn around again, there’s suddenly someone standing next to him—a much older lady who I’ve never met before.

Me: “Hello!”
Strange Lady: “Hello.”
Neighbor: “This is … the mother-in-law.”
Me: “Ah.”
...
Me: “I’m getting one of those soon.”