i would have to go with that crazy NPC in the town south (near mines?) , the one who wouldnt stop talking to you when you walk by him, and was impossible to kill .....
Yeah, I remember that guy... though if I recall correctly, it actually was possible to kill him, the guy had like 1 hp. Or maybe I'm confusing him with a similar personality that appeared in BG II, in Trademeet.
The one from BG 1, if you don't kill him for long enough, you get a reward!
Officer Tenpenny from GTA: San Andreas
---A drug pushing, crooked cop, voiced by Samuel L. Jackson. Need I say more?