DON'T DO THAT!

New toy: TriggerTrap Shield, triggers your camera on sound, light, interrupting a laser beam or basically anything you can think of, if you're good with a soldering iron.
I pointed my spare camera out of the window at New Year's and set it up to trigger on flashing fireworks. I did NOT expect to find a capture of some fireworks bouncing off my car... eek!

Also: happy new year!