Had a bloke come for a car with his uncle or someone, and 2 little girls in tow. It was for their "friend". 2 hour viewing in total, including phone calls, taking photographs, test drive, waiting for their friend to come (they were viewing it for him, apparently)
Friend turns up. Another test drive. I'd already told guy number 1 the last price, of course they tried to haggle me down. "Friend" says "The car's not my style, it's for Guy No. 1, but I'm paying for it, what will you do on the price?" At this point I start losing my rag. Eventually come in to do the paperwork and pay. Guy No. 1 wanted to transfer the money across, at 2pm on a Saturday. Except he doesn't have his card reader....or a banking app...or internet banking full stop.
Eventually sold the car to him 4 hours later when he borrowed the cash off his friends. At least it ended well!