I worked for a company who make rubber stamps, among other things, for print. A client came in out of the blue one day.
Client: Can you make a rubber hand stamp for me?
Me: Absolutely! What were you looking for to be on it?
He then pulled out the service logbook for his car. One page was stamped, and he tapped it.
Client: This one.
Me: Uh… sorry, we can’t do that. It’s illegal.
He got quite stroppy about it, and started yelling.
Me: I’m sorry you feel that way, sir, but you can either keep yelling at me or you realize that I’ve seen your logbook, I know your name and the make and model of your car, and am more than capable of calling the police right now.
He left. I don’t know if he managed to get anyone else to do it but I don’t wish him luck.