have toys in the attic

To be crazy; to act, think, or behave in an eccentric, foolish, or nonsensical manner. Tommy must have toys in the attic if he thinks he can convince our mother to let him get a tattoo for his birthday. There's an old lady who stands on the corner yelling at strangers all day. I think she might have toys in the attic. You can't tell people you want to start a business selling bees as pets—they'll think you have toys in the attic!