The episode explains “be beside yourself” as feeling overwhelmed by a strong emotion, such as joy, grief, anger, or worry. “Be out of your mind” can also express an extreme reaction, but it may sound insulting or stigmatizing when used to label a person. These idioms describe a speaker’s impression, not a medical condition.
Cultural note: The source includes an older example linking unusual behavior to fever. In real life, confusion or sudden behavior changes may need medical attention; idioms are not diagnoses. Prefer describing the specific feeling or behavior to calling someone “crazy” or “out of their mind.”
Keep exploringThe phrase imagines a person standing next to themselves, but its everyday meaning is emotional intensity. Name the emotion to make the expression clear.