A psychology student is helping his professor conduct a personality test. The room is set up with various props in order to move through the assessment quickly. The first person to enter the room starts the test.
"How does this glass of water look to you?" asks the professor.
Person 1 replies, "It is half empty". The student checks 'pessimist.'
A second enters the room. "How does this glass of water look to you?"
He says, "It's half full." The student checks 'optimist.'
Person 3 enters. "How does this glass of water look to you?"
Person 3 answers, "Looks like you have twice as much glass as you need there."
The student looks totally blank and has to consult the professor.
"Oh them!" says the professor. "I forgot to warn you about engineers! They have no personality."
(it really shows that we are far too complex to be simply classified by stupid standardized tests created by our intellectual inferiors... ie, all psych profs)