Use "crackbrained" in a sentence

1. It was his dream that he would marry and have children … and Dan is a man to make his dreams reality … I think he had some crackbrained idea that he could have the wife and family along with my friendship as well … I daresay he thought I would come to terms with Joanna … after all, she was a friend of mine … it made some sort of sense

2. things, we speak of the crackbrained and