I don’t snoop on strangers but I do hear snippets of conversations on public transit or in restaurants. (like you do, if you aren’t on your phone!)
The text in my sketches often comes from these snippets of conversations, taken very much out-of-context. Some are direct quotes, as I remember them, or with light modification.
Feel free to share these but don’t use them as your own. Like most artists, my sketchbook is fodder for my own art.