Are you insane?

What does “Are you insane” mean?

Are you crazy? Said when someone suggests or does something wild or dangerous.

• What's the catch?/wʌts ðə kætʃ/
• Low key./ˌloʊ ˈkiː/
• You are impossible./juː ɑːr ɪmˈpɑːsəbl/
• Are you mocking me?/ɑːr juː ˈmɑːkɪŋ miː/
• You're having an affair./jʊr ˈhævɪŋ ən əˈfer/
• Not another word./nɑːt əˈnʌðər wɜːrd/
• I owe you one./aɪ oʊ juː wʌn/
• It'll pass./ɪtl pæs/