On deathbed dying alone: ...this !@#$ing sucks...
On deathbed, significant other still alive: ...Don't cry for me, we'll meet again (I hope).
On deathbed, Significant other has already died: ...Hey, girl...I'm coming. Keep an eye out for me.
(cliche, I know. But come on!)
About to get shot, blown up, hit by car, some other instantaneous and sudden demise, etc: OHSHI-
On battlefield: OH !@#$ the !@#$ing !@#$head who !@#$ing sent me to this !@#$ing hellhole!!! I never asked to be a !@#$ing soldier!
As superhero/etc getting owned: ...And I couldn't change the world...this sucks...
As superhero performing heroic sacrifice: ...*sigh* Game over, I guess.......BANZAAAAAAI!!! >_< *hits button*