Bradley Cooper put together a very specific set of mannerisms for his character Jackson Maine in A Star is Born.
“Especially the Grammy scene,” he told Vanity Fair, referring to the one where (spoiler alert) Jackson is so drunk he wanders on stage and wets himself.
In order to keep this consistent, he chose to stay in character while in his director role, even in his most inebriated scenes.
Hunched over, he rarely looked other characters in the eyes and mumbled in a booze-addled drawl.