Bad Vibes Only is for stuff that's too moody and spooky to go on a party playlist, but not energetic or manic enough to go on my Noise playlist... So it's got some NIN... IAMX... Fever Ray... Any track with a 30-second moody instrumental opening...
And then the Halloween playlist is literally everything I'd play at a Halloween party so it's got like, Rob Zombie but also the fuckin' Ghostbusters theme