BG1 MONSTERS - What made a meal of you most? PART 1

I don't know about any of you, but I reckon I must have died a bazillion times playing BG over the years thanks to some fiendish monsters I happened to encounter. Mainly because my party was under geared or unprepared, or I was a noob. The general excuses.
I think what tended to kill me most early on was either being torn to shreds by sword spiders and running out of anti poisons or trying my luck collecting Ankegs heads and getting swarmed by them...

How about you?
p.s. Feel free to share tales of your miseries :P

These are just a personal few, needs more than 10 options really...

Edit: Added a part 2 list, See Part 2 and continue vote for most hated!
http://forum.baldursgate.com/discussion/6391/bg1-monsters-what-ruined-your-day-most-part-2#latest

Coming soon...
-NPC's
-TRAPS