Mutton-head

"Of all the mutton-headed things to do," Dr. McCoy grumbled not quite under his breath. He wanted his patient to hear him.

"Bones, you've patched me up dozens of times from scrapes worse than this."

"Maybe so, but those were in the line of duty. This," he said, gesturing at Kirk's broken arm, "is from stupidity. Hold still," he commanded. He gave Kirk a hypo of pain reliever before setting his arm. "While we let the machine do its work, you wanna explain why you insist on life-threatening pastimes like rock climbing?"