According to the website Abacusnews, during Avengers: Endgame's midnight premiere in China, a 21-year-old college student was howling uncontrollably and couldn't stop even after the film had ended.
Doctors had to put an oxygen mask on her in order to alleviate her symptoms and reduce her hyperventilation. Later, the woman was released from hospital.
The premiere of the film Avengers: Endgame took place on 25 April in most countries. A large American cinema chain switched to a 24-hour schedule so that a maximum number of viewers could watch the film.