I kind of like when Worf sets the man's leg while doing triage in Ten-Forward. He tells the man to brace for it, *snap* and the man lets out a stiff grunt/groan.
Worf, The Klingon, tells the human "Good, you bore that well."
Pain props from a Klingon, got to like that. A couple days later the guy was showing a Worf a thing or two in his own training programs.