A bright young psychology major was assigned to help the psychology 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.

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

Person 1: "It is half empty."

The student checks 'pessimist'.

Person 2 enters the room.

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

Person 2: "It is half full."

The student checks 'optimist'.

Person 3 enters the room.

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

Person 3: "Looks like you have twice as much glass as you need

there."

The student looks totally blank and must go consult with the psychology professor. "Oh them!", the professor laughs. "I forgot to warn you about the engineers! They have no personality."