I actually find the 4kids dub of One Piece to be so bad that it's actually kinda funny. I mean they even changed the part where Arlong kills Nami's mum, (can't remember her name) by shooting her, to him just pointing at her and yelling that he's putting her in a dungeon forever.

Seriously though although some of it can be taken as just hilariously bad, some of it is just ridiculous. I mean the shit they think they can get away with is just stupid:
>Guns are edited to water pistols
>Swords are always sheathed, so people basically fight with scabbards
>Editing Luffy's mouth closed while he's eating and talking

The list goes on...

Pic related, it's one of their most ridiculous edits IMO (editing the black out of characters)