A JetBlue passenger on an Airbus A320 attempted to open an emergency exit while the aircraft was on the ground after becoming alarmed by a routine sound from the Power Transfer Unit (PTU). The sound, often described as a 'barking dog,' is a normal hydraulic noise on Airbus A320 series aircraft. Crew members intervened, and no one was injured in the incident. The event gained attention after a video surfaced and was discussed on social media platforms.