Edit: Fallout 1 and 2 had a lot of dialog options based on your stats. Every dialog line was rewritten I your intelligence was low. It's the same, just with the npcs saying things based on these.
Just a little OOT here : it's really sad that this never was reiterated in any games I know of. With the lowest score in intelligence, you character is so dumb that people don't even bother to try with you. It's like : "Radscorpin'... Gun... Go kill!", up to refusing to talk with you.
