That Time Luffy Killed Someone 

Fans of One Piece recognize this scene. If you don't I'll get you up to speed.
April 5th 2009. In retalition for the shooting of his friend Hatchan, Luffy unleashes one of his angriest blows against the shooter and World Noble Saint Charloss.
The blow; a simple one really smacks against the resin bubble, popping it and injuring Charloss. We've rarely seen Luffy this angry or hit someone with this much force…except we have. In fact if you look back just a few years you'll find that a similar blow, once killed someone (non-canonically)
Luffy wrecks the World Noble Saint Charloss for shooting his friend and ally Hatchan. With a single, angry, punch. This punch is commonly featured as one of Luffy's most devastating blows, but most of you may not realize, is that this isn't the first time Luffy has thrown a blow of such wrecking potential.
In the 2005, motion picture One Piece: Baron Omatsuri and the Secret Island, Luffy as described in the One Piece Wiki
"With more hatred for Omatsuri than anyone else had ever provoked, he puts all of his energy into an immensely powerful punch, striking the Baron's face and ending his life.
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