Oh, I'm a ghost and I'm OK; dodge arrows all night 'n' clash swords all day!

[Holbytlass]

Originally Posted by Estelyn Telcontar

But as you know if you've seen "The Invincibles", capes at least are not a good idea for superheroes!

But since the ghosts are already dead, they don't have to worry about dying from cape-accidents!

TGWBS: I think I recall that the "Shadow-land" was a type of parallel spirit world. The Elves dwell partially in it, as do the Wraiths and presumably these ghosts.
Eomer of the Rohirrim: See? That's an explanation I can like. Just don't let anyone try to apply it in the real world.

Hmm, the Bermuda Triangle?

Even in the book, it is said that they 'do not suffer the living to pass' (Eowyn), so how do they stop the living?