I'm sure I had this guy.
He booked a 15min appointment, turned up was ?10 short even though he had said my actual fee when calling to book, said he would pop to cash machine and be back in 10 (I'm pretty sure there was a machine closer than that).
There was no way this was happening as I had another booking 30 min after his was finished.
Told him I would be unable to do the booking and he left.