Our sense of smell is a primal one. Humans have known and used odors to understand the world around them from time immemorial.
We wanna' know 'bout ones you DO remember, for good, for bad, for warning, for introduction, for pranks, or just for innocent fun.
Here, I'll begin: While bouncing the baby gently in your lap, a certain scent tells you that it's time to let Mama have fun with the little tike.