I remember the first time I saw a draugr, it was in the neutral standing position before they're alerted. I was thinking to myself:
"Bet you that thing's gonna get up and move...Nah, it's fine..."
As soon as I turn around and take a few more steps to loot something, I hear the gravelly groan they make and whipped around to see it right in my face. I can say that draugr have made me jump, just that one time

.
Recently, it was actually a black bear... partially because I wasn't expecting it at all, partially because there was no roar of caution or any sound except *thump thump thump* behind me.
Turned around:
"amagahBEARface!"