The scene: A waiting area at a car dealership. I've brought my laptop so I can write while I wait. An older gentleman with a thick book in his hand takes the seat next to me and glances at my computer screen. Old Man: What you writing, your memoirs?
Me: I already wrote my memoir. I'm working on a novel.
Old Man: ~laughs~ "That's a good one!"
The old man slaps me on the knee, stands up, and walks away.
Update: The guy turned out to be really cool. After he come back to the waiting area we ended up talking. Turns out he's an avid readers and got a kick out of meeting a writer. On his way out the door he told everyone else in the waiting room to buy both my books.