So a buddy of mine failed his Linear Algebra exam because he was doing some last minute writing down of answers when time was nearly up and forgot to put his name on two sheets, thus not being allocated 15 points, even if all of his stuff on those would have been correct (and they were lengthy but not very hard, so I'd think he'd have gotten at least 10 of those 15 points).
Now I know that it's entirely his fault, and I'm not seeking to absolve him of any blame, but I still feel sorry for the guy.