It is impossible to make anything foolproof because fools are so ingenious. Whenever you set out to do something, something else must be done first. Every solution breeds new problems. Two wrongs are only the beginning. If at first you don't succeed, destroy all evidence that you tried.
Success always occurs in private, and failure in full view.
Should you find something on your dinner plate that doesn't appeal to you, don't complain. There are people who don't have anything on their plate. Should you find yourself stuck in traffic, don't despair. There are people in this world for whom driving is an unheard of privilege. Should you have a bad day at work, think of the man who has been out of work for years.