Warning to future “Ellen” guests: Halloween week is the wrong time of year to visit the set.

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Saoirse Ronan dropped by “The Ellen DeGeneres Show” on Wednesday. DeGeneres is known for scaring her guests but Ronan got a double dose of adrenalin the day before Halloween. That’s right — not one but two of DeGeneres’ cronies leaped out at the “Brooklyn” actress.

Ronan, 25, stars in “Little Women” alongside frequent collaborator Timothee Chalamet, Meryl Streep, Bob Odenkirk, Emma Watson, and more. She talked about working with the legendary Streep and the latter’s favourite form of fast food.

RELATED: Meryl Streep Ordered Wendy’s To The ‘Little Women’ Set

“Little Women” premieres Christmas Day.