In the United States and Canada, Oppenheimer was released alongside Barbie, in what became known as ' Barbenheimer '. The week of their releases, AMC Theatres announced that over 40,000 AMC Stubs members had already pre-booked tickets to both films on the same day. After grossing $33 million on its first day (including $10.5 million from Thursday night previews), it went on to debut to $82.5 million, finishing second behind Barbie and marking one of the best opening weekends ever for an R-rated drama. 64% of the audience was male, with 33% being 18–34 years old. The Barbenheimer phenomenon was credited with boosting interest in the film, with a total of 79% of tickets sold over the weekend being for the two films (27% for Oppenheimer), a combined total of 18.5 million people. The opening weekend was Nolan's best for an original film, being the highest of his filmography outside of the latter two films from The Dark Knight trilogy. It achieved the third-highest opening weekend for a biopic film, behind The Passion of the Christ (2004) and American Sniper (2014).