Best buy was a 1990 Golf GTi 3 Door Big Bumper, mint condition and had £2k sound system, bloke was going abroad and paid £600 for it, currently awaiting a full refurb as 2 years hard service has shagged every single part of it.
Worst was a sale, the wife sold a full Denby dinner service to a woman in Yorkshire and I spent a day at work bubble wrapping every single piece and send in liners and boxes as I was used to posting out £5k bottles of Cognac and making it utterly drop and crash proof. She sent a load of it back and claimed if was delivered broken when in fact she had swapped it for used items and they had been all hit with a hammer. She won her case and we lost nearly £300, but when I'm in Yorkshire next I'll gain some revenge.