When I was new to members, I tried to walk past Aberrant specters without a nose peg, thinking they're not aggressive, like most Slayer monsters aren't... Made it out of there with 12hp I think, with most of my stuff with me. Couldn't tele away either, because they lowered my magic level to 10 or so... Another one happened when I was still f2p, I was training at ice giants with my full rune. I usually ate at 20hp, but this time I was talking to my friend via pm. After a little chat I looked at my hp only to find that I had 5 points left, and the ice giant was just hitting 0's... Managed to eat before they started hitting constant 8's again.