Quotes by John Pettitt

To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.
To the plumber, any liquid in the glass is potential income.

and Ed O'Connell

How to fix people (listening for engineers :-)
People have really good built in diagnostics.
If you listen well the will tell you what is wrong.
If you listen really well they will hear what is wrong.
If you're an expert listener they will hear what is wrong and realize they no longer need fixing.