We have brilliant arsonists in Vancouver (USA). According to a report in the paper, the allegeds were spotted leaving the restaurant/arson-target-in-question with a gas can in their hands at 3 in the morning. They returned to their SUV, apparently parked nearby, while three police officers watched. The police officers moseyed over and engaged the fellows, who reeked of gasoline, in conversation, during which the fire alarm sounded at the restaurant. Further inspection uncovered the protective tops from flares (the types of flares later found to have started the fire) in their pockets.
The restaurant's sprinkler system put the fire out.
There's an uglier, less amusing side to this story, but I like the dumb parts better.