Hmmmm...
My contribution:
A few years ago I had a bike for sale. The interested party took it for a test ride around the block and brought it back with the chain catching and jumping all over the rear sprocket. He got irate and claimed he had come a long way for the bike and that I had misrepresented the condition of the bike but he still wanted to buy it but at a reduced cost.... and OWED him something, like $100 off the price of the bike, for wasting his time.
An inspection showed that several pins on the chain had been pushed partially inboard so the chain was fouling on the next largest sprocket when it went through the freewheel.... so I flat out refused to sell it to him.
A couple of days ago I had a similar experience with a front wheel that suddenly wobbled because it suddenly got 5 loose spokes on one side during a test ride, and the same demand that I OWED it to the buyer to sell the bike for a deeply discounted price for wasting the guy's time.
Nope.
Bink