How to make someone hopping mad

Dr. Benway held his face in his bloody hands and moaned. Another surgery was over.
The patient was in recovery, still unconscious.
Sadly, that wouldn’t last. And then…
“This is going to be expensive,” said the hospital administrator. “Very expensive.”
“You know, I used to get angry when patients marked their healthy arm with DO NOT AMPUTATE in magic marker,” said Benway. “Where was the magic marker on this one?”
“On his left arm,” said the administrator. “But you cut off his left leg.”
“So I should have cut off his right leg?” asked Benway.
“Go home,” said the administrator.