In reality, this emoji is much more commonly used ironically or sarcastically. It's used to feign innocence, as if to say, "I don't know anything," after playing a prank or doing something mischievous.

For example, after secretly eating a friend's snack, you might send, "What snack? 😇" The contrast between the angelic face and the mischievous act creates humor. It's fascinating how it holds two contradictory meanings: genuine innocence and sly playfulness.