Knock, Knock! Who's there? Doctor Doctor who? That's a great TV show, isn't it?
Knock knock. Who's there? Déja. Déja who? Knock knock.
Knock knock Who's there? Double. Double who? W!
Old doctors never die, they just lose their patience.
Mohan (to the doctor): "Doctor, can you diagnose my Illness?" Doctor: "Your eyesight seems to be poor." Mohan: "How did you come to that conclusion?" Doctor: "You seemed to have missed noticing the sign, hung outside. This is a veterinary hospital."
Knock Knock! Who's there? Testicules. Testicules who? Pillow for penis .
Knock knock? Who's there? Hitler! Hitler who? You Know, the man who kills jews.
A very popular girl went to her doctor and found out that she was pregnant. The doctor says, “I know that you are not married! Do you know who the father of this baby is?” The girl thought and then asked, “Doc, if you ate a can of Baked Beans, would you know which bean made you fart?”
Knock, knock Who's there? I'm Mr, Farter. Mr, Farter who? I've brought some insecticides to give to your mother in law!
Q: Why can't you tell blondes knock-knock jokes? A: Because they leave to go answer the door.
Patient to friend: "I saw the doctor to day about my loss of memory." Friend: "What did he do?" Patient: "He made me pay him in advance."