The brilliant lawyer F. E. Smith once defended a bus driver against claims that his negligence had caused injury to a young man's arm.
"Will you please show us how high you can lift your arm now?" Smith asked the plaintiff.
The young man obediently raised his arm to shoulder level, his face contorted with apparent pain.
"Thank you," said Smith. "And now, please, will you show us how high you could lift it before the accident?"
The man's arm shot above his head.