Last night had two (level 56, hell, act 2 barbarian):
- Waller arcane enchanted plagued that I can't even understand how I survived. More than once I was down to 200 or 300 health out of 37,000 with one second to go on a cooldown or potion but somehow made it. It was a frightening run
- I jumped into a pack of...I think teleporter molten fast and found a champion with his own pack right next to them of something I never got to see. About 30 seconds in, the game suddenly quit with the message "This Game has Been Terminated". Scared the crap out of me and I was absolutely sure I was dead. I kept trying so hard to log in and finally, when it let me in, I found I was sent back to the beginning of the area with all the gold, items, and XP I'd earned intact. My heart was pounding like crazy!
Post your near-death hardcore experiences!