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

Now what?
Goku's training usually involves humiliation, injuries, or both, so you can't blame him for looking a little wary.
 
Added: 2/16/11 From: Celga
 
Now what?