Jackbut
A dumb thing two people start where you have to go up to a total stranger and shout something random and rude in their face like you just woke up and are mad at the world.
I shouted, 'Your breath smells like a garbage can!' at a man eating a sandwich.
She yelled, 'You’re the worst barista ever!' at a woman wearing a coffee cup hat.
He said, 'Your hair is the worst hair ever!' to a guy wearing a hat.