The origin of the idiom "brownie point" can be traced to the mythical creatures known as "brownies" in folklore. Brownies were believed to be household spirits or fairies, often associated with helpful and benevolent actions, such as completing chores or tasks around the home while the occupants slept. The concept of earning "brownie points" likely emerged from the idea that by performing good deeds or being helpful, one could accumulate a form of goodwill or favor from these imaginary beings. It is often used humorously or playfully to acknowledge someone's efforts to please or impress others, especially when there's a sense that these efforts are motivated by the desire for recognition or benefits.