But when it comes to us, it's a lot more complicated. After all, we rarely smile out of fear, but our smile shares a quality with the grimace - we smile to others to form some kind of bond with them, and we do so by showing them that we're not a threat. It's sort of a small appeasement offer, that mustn't originate in fear but rather can be in the context of: "I feel good around you" "I trust you" "I like you".