Many a slip (many things fall) between the cup and the lip.
酒杯来到嘴唇边,得饮与否未可知;物未到手前,未能算己有;凡事难以十拿九稳。
Fortunately for them, the Bank of England has a team called Mutilated Ladies which deals with claims from people who fed their money to a machine or to their dog.