Two psychiatrists (№ 321878)

Two psychiatrists lived in the same house. Every night they came back from their institutions and are often raised together on the same Elevator. The lifter was very much intrigued by one thing that happened every time again and again. The first psychiatrist stepping out of the Elevator, invariably turned and spat on the second. He smiled, calmly took out his handkerchief, wiped his face, tie or coat. Sometimes the lifter even heard he quite chuckled.
He became more and more curious. One day he couldn't resist. Closing the first psychiatrist, he asked:
- For God's sake, doctor, tell me why your colleague is constantly doing that to you?
The second psychiatrist laughed and said:
Oh, I don't know. Why should I bother? That's his problem.