In a class on abnormal psychology, the instructor was about to introduce the subject of manic depression.
The instructor asked, "How would you diagnose a patient who walks back and forth, screaming at the top of his lungs one minute, then sits in a chair weeping uncontrollably the next?"
A young man in the rear raised his hand and suggested earnestly, "A basketball coach?"
Little Johnny's mother was baking cookies one day. As she began to put a new batch in the oven, she suddenly noticed Johnny staring at the already baked cookies lying on the table.
"Johnny," she said. "Are you trying to take a cookie?"
"No," Johnny replied. "I'm trying not to."