This is one of my fav. jokes. This incident actually happened in a court.
Lawyer: "Doctor, before you performed the post-mortem, did you check for a pulse?"
Doctor: "No."
Lawyer: "Did you check for blood pressure?"
Doctor: "No."
Lawyer: "Did you check for breathing?"
Doctor: "No."
Lawyer: "So, then it is possible that the patient was alive when you began the post-mortem?"
Doctor: "No."
Lawyer: "How can you be so sure, doctor?"
Doctor: "Because his brain was sitting on my desk in a jar."
Lawyer: "But could the patient have still been alive nevertheless?"
Doctor: "It is possible that he could have been alive and practicing law somewhere."