The place where you have to get the Nettlebane dagger to heal the Gildergreen tree in Whiterun.
There are spike patches around the promontory that the hagraven on. I did not know this. I walked right into one while skirting around the promontory to get cover from fireballs while also fighting off a witch down in the area around the promontory.
It made a stabby sound so when I died I was like "OMG WTF? Who was stabbing me from behind!?!?"
Then when I reloaded and tried again, I walked into one and managed to step out before it killed me, and then I noticed it was spikey in some patches.
Real deaths? Tried to unrelenting force a horse off the top of high Hrothgrar, turned out I had whirlwind sprint on instead...
http://memegenerator.net/cache/instances/250x250/11/11713/11994237.jpg.