Have you noticed how some parents are very careful what they say around their infants, even chiding friends who use inappropriate language around Baby? But she’s an infant. She has no idea what anyone’s saying, right? Well, if you’re dropping four-letter words around your baby niece, you may want to think twice. Sure, her main activity might be sucking on her own toes and nodding off, but plenty of baby experts have asserted these little rug rats may actually be actively listening. That’s exciting and kind of terrifying, like having a miniature spy in your own home. Today, for every baby—or seemingly half-witted colleague—you encounter, do your best to be respectful. Maybe your spirited theories about the meaning of life will fall on confused ears, but you never know, you may get a contemplative response in the form of “Goo goo gaga,” or some other such clearly profound retort. It’s worth a shot!