Beware of the young doctor and the old barber.
Beware of programmers who carry screwdrivers.
Beware of too much laughter, for it deadens the mind and produces oblivion.
Beware Of entrance to a quarrel; but being in, Bear't that the opposed may beware of thee. Give every man thy ear, but few thy voice; Take each man's censure, but reserve thy judgment. Costly thy habit as thy purse can buy, But not express'd in fancy; rich, not gaudy; For the apparel oft proclaims the man.
Beware the ides of March.
Beware of the man who knows the answer before he understands the question.
Beware the pull on your heartstrings -- it's often the pursestrings that are actually being reached for.
Beware the fury of a patient man.
Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before.
Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before... He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way.