A particular rip-off is airport parking charges and the way they are tapered.
Say it is £1 per hour up to 10 hours, levelling off there at £10 per day.
However if you park for just over 24 hours it is not assessed as 1 day plus the hours, but two days, so jumps from £10 to £20.
It is particularly significant because of the number of passengers who depart on an outbound flight, then return on the inbound working of that flighta day or so later, so they have parked for just over the 24 hours.