The other day, I was coming out of a cave, (the one with Clavicus Vile's axe...forgot the name) and I saw a wolf. I snuck up to it to stab it, and did. Then I saw 3 Imperial guards running up the road towards me, and they ran right past. (I wasn't sneaking any more) 2 seconds later, I see sparks in the distance, so I fired an arrow at the source. (it was dark) An enemy life bar shows up and it's a master lightning mage. I thought, '"cool, I'll go take him on!" Next thing I know, he one-shots me from about 20 meters away, and I'm dead. Level 49, all legendary elven armor with +59 health enchantment, and wearing The Gauldur amulet for another +30 health, stamina & magicka. If I hadn't had my bow equipped, I would have had the shield "Spellbreaker", but I don't think I would have even had time to raise it.
I let dragons beat on me a bit, to raise my light armor skill! Crazy to get killed like that.