scare the (living) daylights out of
US /skɛr ðə ˈlɪvɪŋ ˈdeɪˌlaɪts aʊt əv/
UK /skɛr ðə ˈlɪvɪŋ ˈdeɪˌlaɪts aʊt əv/

1.
to frighten someone very badly
:
•
The sudden loud noise scared the living daylights out of me.
•
That horror movie always scares the daylights out of me.