Shock horror
Definition 1 of 2
Pro Tip 1/3Literal Meaning
Used when something is genuinely surprising or appalling. 
I saw the haunted house and, shock horror, it really had a ghost!
Pro Tip 2/3Dramatic Effect
Often used to emphasize the impact of a revelation or incident. 
She walked in and, shock horror, the whole room was decorated for her birthday.
Pro Tip 3/3Emotional Intensity
Can communicate a strong emotional response, usually negative. 
He read the note and, shock horror, his face went pale.