What’s your native language’s idiom for “When pigs fly” meaning something won’t ever happen.

I know of some very fun translations of this that I wanted to verify if anyone can chime in! ex:

Russian - when the lobster whistles on the mountain. French: When chickens have teeth Egyptian Arabic: When you see your earlobe

Edit: if possible, could you include the language, original idiom, and the literal translation?

Particularly interested in if there are any Thai, Indonesian, Sinhala, Estonian, Bretons, Irish, or any Native American or Australian equivalents! But would love to see any from any language group!