Quote Originally Posted by Crocodile View Post
Good question. I would personally not do it, as I think the idioms are something very stable. If I would say something like: "That is set in stone once in a blue moon," would that sound good in English?
But we do these things in English, sometimes as jokes. But its possible to put idioms together when there is something parallel about them, that they go together. Sometimes they work, and sometimes they don't.

You can jump the shark, once in a blue moon.