You see, when the tolomacks invented the precursor of today's chewing gum in 8518 B.C., they first used it as a means of communication. They would cut strips of sweet, soft sap from tree trunks and imprint teeth marks on it, forming different characters on the surface, then they would pass it on to their interlocutor and so on. They were very calm people, but during an increasingly trying period of social upheaval, they started having heated and rather moist debates and arguments amongst each other, and sinking their teeth too hard in order to make a point, during which time they figured out that substance was tasty and comforting for their anxieties. Still, they didn't want to eat that crap. They would spit it out at some point... So they chose chewing and spitting over communication, and hence no one knows what happened to them afterwards.
Why are nipples so roundish?
