Sawing wood

A doctor of psychology was doing his normal morning rounds when he
entered a patient's room. He found Patient #1 sitting on the floor,
pretending to saw a piece of wood in half.

Patient #2 was hanging from the ceiling, by his feet.

The doctor asked patient number 1 what he was doing. The patient
replied, "Can't you see I'm sawing this piece of wood in half?"
The doctor inquired of Patient #1 what Patient #2 was doing.
Patient #1 replied, "Oh. He's my friend, but he's a little crazy. He
thinks he's a lightbulb." The doctor looks up and notices Patient
#2's face is going all red.

The doctor asks Patient #1, "If he's your friend, you should get him
down from there before he hurts himself"

Patient #1 replies, "What? And work in the dark?"

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