What "at certain phases of the moon" Means, is this a slang:
Jesus: The whole point of going into the desert is not eating bread. If I wanted bread I'd go to a shop. As for throwing yourself off a mountain and letting the angels catch you … Does that sound tempting? Or am I missing something?
Kay: Throwing yourself off a mountain and actually hitting the ground. That sounds tempting. You know, at certain phases of the moon.