You scared the hell out of me

You scared the hell out of me.

 and You scared the crap out of me.; You scared the dickens out of me.; You scared the devil out of me.; You scared me out of my wits.; You scared the pants off (of) me.
You frightened me very badly. (Also with subjects other than second person. Of is usually retained before pronouns.) He scared the hell out of all of us. She really scared the pants off of me.
See also: hell, of, out, scare