Well, the first time i want to bleak falls barrow, obviously i didn't know that giant spider was going to drop at me, so i killed the smaller one and wen "YAY I CAN GET UP AND SPRINT NOW!!

"
then the spider dropped behind me, i nearlt pooped myself, and i couldn't feel my hands properly until i got out of the cave.
but i still can't stand to walk by them, so i don't mind wasting a shout or two to clear push them out of the way, plus, now i have installed the real lighting mod that makes caves much, much darker.
however in real life i'm used to kill spiders/cockroaches and i don't mind.
Also, another bad thing is, if you have played half life 2, the chapter where the bugs don't attack you and follow you in tunnels, so i have killed everyone and i happily turn around to see them standing at 1 feet from me. that's probably the game that made me jump out of my chair the most times.