San Francisco’s streets have seen their fair share of oddities — but a gun-toting man with a pet duck riding in the backseat of a purple Ferrari may take the cake. Police arrested 51-year-old Brian Currier on Monday after he allegedly waved a gun at a pedestrian, authorities said. The flamboyant gunslinger then barricaded himself inside his apartment in the luxe Nob Hill neighborhood, prompting an hours-long standoff, according to cops. Neighbors told The San Francisco Standard that Currier was a local curiosity, often spotted zipping around in his flashy purple Ferrari with his duck, Daisy, like a loyal sidekick....