Birdy

Cowboy Bebop

Dragonball

Flame of Recca

Gundam Wing

Hunter x Hunter

Inuyasha

Mononoke Hime

Oddments

Outlaw Star

Ranma 1/2

Rurouni Kenshin

Trigun

Yuu Yuu Hakusho

Duhhh
Domon has this effect on people -- your IQ starts to go down just by begin around him.
 
Added: 3/7/08
 
Duhhh