I thought funny games(2007) was comedy gold lol but really it was just a thriller
But it's packaged as a horror/crime movie
So do what you want with that information
Imagine a family rents out one of those cliche light hearted kid friendly Christmas movies. They all laughing and enjoying it then at some point santa snaps and takes out an axe or something and goes swinging going full Jack Torrance like the shining for just 5 mins. Then resumes normal behavior.
That would be a great horror film. I would love to see people's reactions.