And the moon is made of (green) cheese phrase
Used to implicate utter incredulity in something said or believed by someone else.
A: "I will run for election next month " B: "Ha, yeah right, and the moon is made of cheese!"
A: "Don't be too suspicious! He just has good intentions." B: "Sure, and the moon is made of cheese!"
A: "Don't venture out into the forest because evil spirits lived in it." B: "Yeah, and the moon is made of cheese!"
To express that you don't believe in something that someone has just said
Used to demonstrate things which never or unlikely happen.
An exclamation given to express the feeling of disbelief in something that has occured
Used to express a surprise or astonishment, particularly in response to the information which have been recently revealed
This saying is usually used in a sarcastic way.
This expression dates from the early 16th century.