Canadian artist Maskull Lasserre crafted a violin-esque instrument around a Magnum revolver. When you fire the gun, the strings resonate. It's like the 1920s gangsters who carry tommy guns in violin cases, but in reverse.
Oh great, Katy Perry's starting the phase of her career where she wants to be taken as a serious artiste. We still have at least one concept album about psychedelic space walruses to look forward to before she gets it out of her system.