I've got a car advertised and so far I've had 12 different emails with the "I'll pay you by cheque" shit and "My Broker will pick it up as its going to Holland, Nigeria, etc, etc"

I was just thinking (a rare thing I know ) how can I waste as much as there time as possible and lead the feckers on?

Any ideas as I want this to be a classic and to do their heads in so much it will hurt them