What does “have you lost your mind” mean?

A rhetorical question showing shock or disbelief that what someone just said, suggested, or did is crazy, reckless, or absurd.

How is “have you lost your mind” used?

In The Day After Tomorrow (2004), one line is: “Have you lost your mind, Hall? I have to go.”

The clip at the top of this page is from The Day After Tomorrow (2004).

Have you lost your mind, Hall? I have to go.

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