Riddles

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Q: A father and his son were in a car accident. The father died. The son was taken to the hospital. The doctor came in and said: I can't do surgery on him, because he's my son. Who was the doctor?
A: The doctor was his mother.

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Q: Why did the pony have a sore throat?
A: Because it was a little horse. (hoarse)

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Q: Do you know where people send a horse when it is sick?
A: To a horsepital.

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Q: What did the doctor say when the invisible man called to make an appointment?
A: Tell him I can't see him today.

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When is a sick person a contradiction? (When he is an impatient patient)