...when you see a car you sold 29 days ago that needed a new power steering unit before it went out turn up on the forecourt and it's too late to go hide, only for them to tell you they love it so much that they want to find a car for their mum to buy!
...buoyed by this confidence you see a focus you sold a few weeks back arrive and greet Mr Customer with a warm smile and handshake only to be told his gearbox is knackered, he's not very happy, and the warranty company aren't interested.
Swings and bloody roundabouts