I often mis-remember/combine/ or translate idiomatic phrases, much to the puzzlement and amusement of those around me.
I cleaned up my studio on Sunday, sat down at my drawing table, and couldn’t think of anything to draw or paint. Sometimes if I paint a background, I get inspired so I mixed up a bright, spring-green color. The color made me think of the expression, “like mushrooms in Spring.” Afterwards I realized that expression doesn’t exist — I had confused the phrasing of “springing up like mushroom after rain.” Oy.