In Fallout: New Vegas, I..
I umm..
Umm..
I never die.
On a serious note, I died by screwing around with knocking Boone unconcious in front of the Gun Runners; I threw a Holy Frag Grenade at him, and somehow it went flying back at me, doing a little bit of damage when it hit me, and then blowing my ass over the kiosk and into the side of the Gun Runners' compound.