"You're not paying attention. You need to put on your thinking cap today," Daddy says.
"I don't have a thinking cap. Maybe I'll have to wear my helmet" Amilia says. (meaning her bicycle helmet)
For a split second, I was torn between explaining the figure of speech and actually finding her a "thinking cap." Ultimately, I ran to the bedroom and grabbed one of her favorite special barrettes made by moi.
"Better-here is your thinking BARRETTE," say I.
She was very pleased.