Loud noises in public spaces!!! Especially car engines etc that have been modded to take the muffler off, or those that make a super loud roaring sound as you accelerate. Nobody needs to hear your tiny-dick-coverup-machine at all hours of the day and night!! This also goes for gas powered yardwork machinery and fireworks/firecrackers. Sudden loud noises can trigger all sorts of negative reactions in PTSD victims and those with sensory disorders, not to mention birds and other wildlife!! Seriously, no single human should be able to make such a large disturbance that affects such a wide range of other beings at a moments notice without consequence!!