Sydney Sweeney reveals shock detail about acting process

Sydney Sweeney shared that she feels “bad” for her costars because of her erratic behaviour on set.

The 27-year-old actress discussed her upcoming movie Echo Valley in a new interview saying that she feels “psychotic” switching from one emotion to another as she performs her scenes.

Sweeney said that she jumps into her trailer and comes out as the character while she shoots, during her appearance at The Tonight Show Starring Jimmy Fallon on Thursday, June 5.

"Like, you're happy and fun, and then ... " replied the host and Sweeney responded, "And then they say, 'Action!' and then I'm screaming and crying."

The Euphoria star added, "And then they call, 'Cut!' and I go, 'What's wrong?'” and the audience roared into laughter.

Speaking of her co-star Julianne Moore in the upcoming release, Sweeney noted that she "is the most incredible human being."

Although as Fallon asked, the actresses, who play a mother and daughter, did have to get in “arguing scenes" which Sweeney said "I felt so bad" about.

"I did. 'Cause I am ... I'm vicious. I'm really vicious," she added.

Echo Valley is set to be released on June 13.