My son sees a group of children playing in the lobby of the building museum and admires them. So, he tries to engage them by glowering and roaring. It is going about as well as you would expect.
UPDATE: I suggested he wave and say hello. “No, I just roar.” But who am I to predict the social cues of young boys? Now they are chasing each other and the admired boys are following the little lion-man around. They are all laughing.