The Nightmare of Baldimore was an incident that was caused by Franky after he was sent to the country of Baldimore by Bartholomew Kuma in the year 1522.
A large portion of Karakuri Island was blown up by an explosion caused by Franky, who activated the self-destruct switch in Vegapunk's laboratory. Although Kitton's grandfather warned him about it, Franky mistook the button's skull and crossbones design for a pirate symbol and pressed it, causing the whole lab to explode. News of the incident swiftly spread around the world and the event was dubbed "The Nightmare of Barujimoa".[1]
Trivia
This is the second time a "danger" skull and crossbones was mistaken for a jolly roger, the first being when Chopper went to look for the poisonous Amiudake mushroom. Interestingly, both instances involved a doctor of one profession or another, and both occurred on Winter Islands.
Beasts Pirates(Legendary Hour, Fire Festival, New Onigashima Project)*
Blackbeard Pirates(Duel on Banaro Island, Summit War of Marineford, Payback War)*
Straw Hat Pirates(Operation Utopia, Davy Back Fight, Buster Call, Celestial Dragon Hit-and-Run Incident, Operation SOP, Dead End Race, Turtle Car Race, Pirates Festival)*
