Maybe instead of a zombie apocalypse there's a disease where everyone turns into zombie clowns where the hoards that come after you and tickle you until you die.
I conceptualized an idea that the monsters at the end of monsters inc, because their objective is to make kids laugh, their new title is tickle monsters, and most of them turn to tickling children cause it's a faster method of getting kids to laugh. Essentially turning the happy solution on its head making them scary again.
Ive seen tickle monster horror movie concepts but I want one that feels real. I like concepts where the thing that tickles you is a thing, or a being that can't be argued with or talk back. In a lot of stories the banter is all the same and it's boring.