As a server for several years, I can tell you, customers in restaurants say some crazy sh--. From stupid questions: "Do you have a bathroom?" (Nope! Sorry! No bathroom here at this fully functioning restaurant in the United States in 2015), to ridiculous complaints: "Your Alfredo sauce is really white. Like, it's too white.", I'm pretty sure I've heard it all.
I imagine some pretty weird and entertaining stuff comes from mouths of those shopping at record stores too.