A poster showing a fish caught on a hook,
"Even a fish would stay out of the trouble if it kept its mouth shut."

All constants are variables.

An error doesn't become a mistake until you choose to ignore it.

An optimist laughs to forget,
a pessimist forgets to laugh.

An original is a creation motivated by desire. Any reproduction of an original is motivated by necessity. To create is divine, to reproduce is human.

Anger opens the mouth and shuts the mind.

Any wire or tube cut to length will be too short.

After any machine or unit has been completely assembled, extra-components will be found on the bench.

After the last 16 mounting screws have been removed from an access plate, it will be discovered that the wrong access plate has been removed.

Any errors which creep in will always be in the direction causing most damage.