I for one take a deep long breath through my nose then exhale in the most pressurized raspy manner without vocalizing it.
I sound like a hissing snake crossed with a non-whistling kettle of boiling water
I've on occasions pantomined screaming in absolute pain and agony but made no noise, but those are usually for glancing blows to the toes
Every time I stub my toe I use it as an excuse to discharge all the screams I've stifled since the last time I stubbed my toe.
I get super mad and if i'm alone i get loud about it, but if there is someone nearby i just screw up my whole face and stew on it for half a second and then spit "fuck" through my teeth with a really hard 'f,' and either way i feel like an idiot
IMPULSE 1) Scream "FUCK" as loud as possible to flood my nerves with anger and overcome the pain IMPULSE 2) Make no noise because people will look oh god no people looking
RESULT) Closed-mouth muffled animal growl like a fucking weirdo
I usually inhale sharply, grimace, and say "bastard" under my breath
inhales mMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM mmmmmmmmmmmmmmmmmmmmm mmmmmmm mmm
Usually will do similar breathing to you, but then say something like "god dang it" in a fairly calm manner. Research indicates that vocalizing swear words can actually increase pain tolerance btw. I think part of my calmness is usually due to witnessing the stubbing like I'm seeing it happen to someone else, so it's more about the cringe of it happening than the pain I am experiencing. Also helps to kinda laugh it off, in the vein of "well that was a pretty careless move".