"Personality Test" joke

A bright young psychology major was to help the professor in conducting a personality test. The room was set up with various props in order to move through the assessment quickly.

The first person to enter the room started through the test. "How does this glass of water look to you?" the psychology major asks.

Person 1: "It is half empty."

The student checks' pessimist' on his chart.

Person 2 enters the room.

"How does this glass of water look to you?"

Person 2: "It is half full."

The student checks' optimist' on his chart.

Person 3 enters the room.

"How does this glass of water look to you?"

Person 3: "Looks like you have entirely too much glass there."

The researcher looks totally confused and must go consult with his professor.

"Oh them!" the professor says. "I forgot to warn you about the engineers! They have no personality."