Anna Kendrick has nice company Brittany Snow.

The Woman of the Hour star – who also makes her directorial debut in the thriller – revealed she went to a Halloween party with her Pitch Perfect costar last year, where things quickly took a psychedelic turn.

“We went to this party and someone asked if I wanted to try microdosing mushrooms,” Anna recalled during an appearance on The Late Show with Stephen Colbert October 23. “They’re little chocolate bars and everyone takes a square, and I thought – just to be on the safe side, even my microdose – I would cut it in half and then just take half.”

But the 39-year-old’s caution proved futile, as she soon discovered that the hallucinogen often doesn’t mix evenly into chocolate.

“Sometimes there can be a small bite that doesn’t have a microdose, but a real macrodose,” says the Twilight alum explained. “So I’m at this party and it’s the first time I’ve tried mushrooms, and I just get so high. And I just start saying, ‘Oh no. Oh, I’m so high. Oh God, I’m so high.’ And I just can’t help but say it.”