The title pretty much sums it up. There are som many great animators for this series so let's give them a shout out. What is your favorite piece or scene from any One Piece animation, it can be either from the anime, the movies, the openings, the games or from commercials. You are of course free to mention more than one and naming your favorite animator is encouraged.
I can't really decide but for now I'm going to go with the part in Kokoro no Chizu where Aokiji freezes Luffy's arm. Might not be much but I just adore it and I think Noboru Koizumi did a great job with it.