Have you ever felt like an idiom?

I taught idioms in 4th grade. An idiom is a word or group of words that say one thing, but mean something else.
An example: It's raining cats and dogs. It means that it's raining very hard. But, it does not mean that cats and dogs are coming down with the liquid drops.
Idioms can be difficult because they're largely cultural. However some are universal.
While a fiction writer probably wouldn't use them for the narrator, she/he may have the characters use one once in awhile. It spices up the dialogue. Kids seem to really enjoy the word and the colloquial phrases that accompany.
So, keep in touch, because I'm all ears. Don't get cold feet or feel like a fish out of water by writing to me. You'll get a kick out of it. Well, I'm going to call it a day and make like a tree and leave(s).
Or something like that!