Lupita Nyong'o terrified an audience member in the bathroom during an 'Us' screening

You know you've made a scary movie when you can make an audience member jump just by bumping into them in the toilet mid-way through the film.

Well, apparently that's what happened to Lupita Nyong'o during a recent screening of her new horror movie Us.

"At one point I went to the bathroom while the movie was going on, and another lady came out of the stall to wash her hands," Nyong'o explains to Stephen Colbert in the clip above. "And I emerged from my stall and she near had a heart attack."

Luckily the woman recovered enough to ask for a selfie shortly after, so we're guessing she's okay now.