howling
Howling is the painful greeting delivered in collusion by a microphone and speaker to your eardrums. Its metallic scream echoing through a conference room is a ceremonial rite that instantly freezes earnest debate into a glacial stasis. People call it the "audio boomerang," as it hurtles back to your own ears the moment it is unleashed. This high-pitched resonance may well be the most effective alarm humanity has ever devised.