Na Foo
A cursed phrase that gets stuck in your brain and makes you scream 'Foo Foo Na Na' until you're out of your mind.
I heard 'Na Foo' in my dreams and woke up yelling 'Foo Foo Na Na!' at my brother.
The teacher said 'Na Foo' and now the whole class is chanting 'Foo Foo Na Na!' in the hallway.
My dog barked 'Na Foo' and now he’s stuck saying 'Foo Foo Na Na' every time I open the door.