Maybe one for the car thread but I saw a car with a £300 admin fee:
2019 Red Vauxhall Astra 1.4i Turbo GPF Design Hatchback 5dr Petrol Auto Euro 6 (s/s) (150 ps) for sale for £12,300 in Addington, Kent (autotrader.co.uk)
What possible justification could there ever be for such a ridiculously extortionate fee? I can't believe anyone would pay it.