Fallout New Vegas has a hostage situation in a demolished city called Boulder. As with most Fallout quests, you can side with either of the warring factions, do nothing or save the day.
Naturally, I negotiated a truce, rescued the hostages then proceeded to murder everybody in sight once I got my reward. Silenced sniper rifles and handguns took care of the NCR troops, a hundred or so landmines scattered the Great Khans across the desert and both of the hostages were separated from their heads with the aid of my trusty hunting shotgun.
Then I stole a few hats and got stuck in a wall, but whatever. I returned to the scene of the crime a few days later, only to find this guy making repeated "Whoa" expressions.
Wondering what he was on about, I set off in a few random directions to get to the bottom of his odd antics.
Hey look, some people in the distance.
I'd better go see what OH GOD JESUS WHAT THE HELL IS THAT
Just like real life, it seems that killing hostages will bring them back from the dead (still missing the clothes you stole from their mangled corpses). Shooting near the headless zombies of doom makes them run away, complete with decapitated head trailing along the floor behind them.
Check it out, casually going for a stroll sans head.
Just when you're getting used to the headless wonders, things get freaky again.
You can go into VATS and aim at their head, as if it's still bolted on to the top of their neck.
If you fail to shoot, exit VATS and pan back up to where their head once was? Yep, they've grown a new head complete with seethrough eye sockets and menacing zombie walk.
And the screaming starts again...