
Scare the shit out of somebody
Very Informal
This phrase is very casual and can be inappropriate in formal or polite situations.

I'd never use 'scared the shit out of me' in a job interview.
Intensity
Use it to express an extreme level of fear, more than just being 'scared'.

When I saw the spider, it scared the shit out of me.
Not Literal
It's a figure of speech for extreme fear, not to be taken literally.

Hearing the ghost story around the campfire scared the shit out of me.
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