I Should Probably Be Dead Now

A character has taken a bullet to the gut and keeps walking. Ok. Improbable, but not out of the realm of possibility. A character gets an arm chopped clean off and continues fighting. Woah. That's kind of intense. A character gets a gigantic hole blown right through the middle of their chest and keeps on moving. Wait, WHAT?!

Although this strains plausibility, if it's cool enough, the badass factor is often enough to override any potential suspension of disbelief issues.

For the softer version of this, see: It's Just a Flesh Wound, in which a character shrugs off some injuries that, while not fatal, would clearly be much more of a hinderance in reality.

See also: Dying Speech, when a character who should be dead holds on just long enough to utter some dramatic final words.