Being crazy can mean many things. This term can refer to being carefree and acting in a way that is not prudent or acceptable in public. Being crazy can also mean being mentally ill, with a detachment from the real world and society. Someone who acts crazy may talk to themselves, believe things that are impossible or obviously untrue, or even feel like they are being persecuted or watched. Being crazy can also mean acting in a way that others do not understand, like an eccentric who hoards their wealth while living in squalor.