The conversation between human and AI assistant.
[|Human|] Give an example of when it would be appropriate to use the phrase “once in a blue moon”.
[|AI|] "Once in a blue moon" is a phrase used to describe a rare event or occurrence. An example of when it would be appropriate to use this phrase could be: "I hardly ever eat junk food. I only have it once in a blue moon." This means that the person rarely eats junk food and it is a rare occurrence when they do.
[|Human|] 
Give an example of when it would be appropriate to use the phrase “once in a blue moon”.