A rather insistent cross-examiner asks a pathologist whether he can be absolutely sure that a certain patient was dead before he began the autopsy. The pathologist says he's absolutely certain. Oh, but how can you be so sure? Because, the pathologist says, his brain was in a jar sitting on my desk. But, says the cross-examiner, could the patient still have been alive nevertheless? Well, comes the answer, it's possible he could have been alive and practicing law somewhere.