I once rang the organiser of a science fair at Leeds Univerity in the evening to confirm the arrival of two coach loads of kids for the following day only to be told: "The fair was today"
I felt sick, my stomach knotted and I instantly planned an alternative trip to Whitby with fish and chips thrown in to buy the kids' silence.
After a long silence on the phone she then said: "it's a good job that it's a two day event and you're welcome to attend the primary school's event tomorrow"
I reckon she got a lot of pleasure out of stringing me out for what seemed a lifetime.