I can only think of one person. I only strongly suspect he's homeless, as he's very often at the bowling alley and is... not in his right mind. He'll be talking to you about who-knows-what as if carrying on a full conversation with a good friend, and you might not even know it because he might do it when your back is turned. He doesn't seem to be a bad man in any way--he's kind of like the bowling alley's resident grandpa. If he ever catches me in a "conversation" and I notice, I just smile and nod, even though I don't think it makes much a difference. I don't know how, but he gets by (maybe he gets free burgers from the snack bar--if so, he's pretty lucky for a homeless person).