mckirk edits

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Space: the final frontier. These are the voyages of the starship Enterprise. Its five-year mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before.

I blame this picture of Karl

Imagine Bones using boxing in his free time as a way to let off steam

And at first Jim is like “what? you’re not already at your ‘angry’ level?”
but Bones is just GRUMPY most of the time - Jim hasn’t actually seen him angry

A mission goes horribly utterly south - the enterprise is trying to broker a peace trust between two alien groups on the same planet, but the situation breaks into a civil war instead. One side totally lied to the more passive side and then swept in to kill them while they were unprepared. 
There is nothing but panic and screams in the air. the crew of the enterprise is trying to rescue as many defenseless citizens as they can but it’s still a bloodbath 

Bones is doing his best, but his best is still only saving 25% of the half-dead citizens that are getting beamed in. Bones is LIVID: this is UNNECESSARY DEATH, this is brutal senseless slaughter by a bunch of, and to quote Bones “dickless pieces of shit” (Spock: “I don’t think this particular race has what you humans coliquially call 'dicks’”  Bones: “shut up Spock, they’re still assholes”) Jim sees Bones angry, TRULY angry for the first time. He’s all strong southern drawl and sharp tongued swearwords in between trying to soothe the scared citizens in his med bay.  

Long tension-filled hours pass and finally the flow of new patients slows down. As soon as the citizens are patched up and the worst seems over, Bones excuses himself for a quick break and Jim is too curious not to follow. 

He finds Bones punching the living daylights out of a hanging punching bag in his room.
He doesn’t bother addressing Jim when he hears the door slide open. He just keeps punching the bag, a look of determined fury in his eyes. It’s a sight to behold. Jim can see real power in those punches, and they’re coming so fast he’s already lost count. Jim’s starting to think the most gentle hands he’s ever seen might also be the strongest.