After I tell you that I don't know the person you are calling for, phone me back two business days later and ask again. Perhaps I'll remember him by that time. (This is particularly effective if both calls come hideously early in the day. Like around 7:00 a.m.) Even if the last name is unique, it doesn't mean we're all related, so stop it. I do not know him. I've told you that. And I don't particularly care if he owes you money, so knock it off.