have you gone raving mad

Cheifly Northern English

Have you gone completely insane

The Moon is made out of cheese. Have you gone Raving Mad! The moon isn't made out of you silly old bat.

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i've never heard such rubbish

(Archeic) Idiom Cheifly British

Used when someone is talking nonsense

Aliens, Extraterrestrial life forms... I've never heard such rubbish.