Lol.....i just saw the 'brave' imperial guards in action.
I was walking up to the Moonmoth Legion Fort and just as i go under the arch entrance a legion falls off the wall landing right in front of me XD
Maybe throwing themselves off walls or repeatedly walking into solid objects is part of their training!? You know like, toughening themselves up for fights with DElves & Nords, that kind of thing? :unsure:
>>>>>
Incidentally, http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=1095 does a really good job of stopping NPCs getting stuck on things or repeatedly walking into them, though it doesn't seem to stop them occasionally spectacularly falling off things.