Blockers: Her daughter's first time

What’s happening in this movie clip?
As Julie and Austin are preparing to have their first time, Julie has no idea her mother Lisa (Leslie Mann) is under the bed.

What’s the movie about?
After seeing the friendship of their children, Lisa (Leslie Mann), Mitchell (John Cena) and Hunter (Ike Barinholtz) become friends. Afraid that their daughters will lose virginity on prom night, they try to stop this from happening.

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