A man who was very upset walked in to see his doctor.

A man who was very upset walked in to see his doctor.
"Doctor, you've got to help me!
" he wailed.
"What seems to be the trouble?
" asked the doctor.
"I keep having the same dream, night after night.
There's this door with a sign on it, and I push and push the door but I can't get it open." "What does the sign say?
" asked the Doctor.
"Pull," said the patient.