Garthanos
Arcadian Knight
I had to go back and check my copy of Chainmail. When I wrote that last post, I was specifically thinking of the SuperHero being able to 1-hit kill dragons with an arrow (for some reason I thought it was an Elf ability). At any rate, the first thing I thought of when I read that rule in Chainmail was the scene in The Hobbit where Bard the Bowman drops Smaug (admittedly it's not from LotR, but it's still pure strain Tolkien). Perhaps that wasn't intentional, but I'm not aware of any other scene in literature where a hero 1-hit kills a dragon with an arrow (or enchanted arrow).
I lke to point out that the dragon had already been attacked many many many times... and that by the time that final bow shot took place his "luck" had already been worn pretty thin. D&D hit points were abstract for many many years and are now again.