Guy builds a gadget to blast loud music back at neighbors

YouTuber Matthew Br made a gadget that senses when the rude people in the apartment next to him play loud music and blasts especially annoying music back at them through the wall. The device gives the neighbors a short grace period that stops it from triggering if the neighbors sneeze or drop something heavy, but if the loud music goes on too long, the device kicks into action and punishes them with a high decibel onslaught.[via]