Nightmare of Baldimore

The Nightmare of Barujimoa (バルジモアの悪夢) is an incident that occured when a large portion of Karakuri Island was blown off by an explosion caused by Franky, who activated the self-destruct switch in Vegapunk's Lab. Although Kitton's grandfather warned him about it, Franky mistook the skull and crossbones design as a pirate symbol and pressed it, causing the whole lab to explode. News of the incident soon spread around the world and was dubbed "The Nightmare of Barujimoa".

Trivia

 * This is the second time a Danger skull and crossbones was mistaken as a pirate symbol. The first being when Chopper went to look for a poisonous mushroom.