Re: Firefly first-time/rewatch (NO SPOILERS, please)
ETA: Doesn't Baldwin use the 'I was aiming for his head' gag. I'm sure I've heard that before, but did Whedon originate it?
Whedon didn't originate the line, because the whole joke - and variations of it - has been used for quite awhile:
Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life.
- Terry Pratchett -