Note to self: Hot ends pre-heated to ABS temps are Freekin HOT.
I burn myself every couple of weeks. 
So are soldering irons…
Nothing beats playing a lot of video games in such cases… Fingers are used to abuse. I fondly remember one occasion where I managed to catch a falling soldering iron, of course I got the hot part between my fingers. No blister (not much pain either) thanks to excessive sessions of multi-player Tetris DS between classes around that time 
I burnt the top of my left hand, I am pretty sure it was a 3rd degree burn but I heal quick so no worries.
Preheated to PLA temp is pretty darn hot as well