Ok, you KOTH fans, you might have noticed that almost all characters on KOTH have below average intelligence. I think that just adds to the humor, and further satirizes Americans, especially Texans. I mean even Hank says some stupid things at times, although he is far smarter than the majority of characters.
My top 3 would be
1. Peggy Hill- All the more stupid because she thinks she a genius, with an "IQ" of 175!! haha
2. Luanne Platter, started out with average intelligence but got dumber and dumber throughout the series. Even at one point thinks that Ladybird can talk!
3. Bobby Hill- This poor kid has a learning disorder, he was even in special ed for a short period of time.
So weigh in, Dale? Boomhauer? Bill?, if you vote other, please specify with a reply
I have a hard time picking who's dumber, Luanne or Peggy, must be those Platter genes