Someone ask me about confidence-establishing and assertive behaviors in humans being essentially ritualized forms of threat display on a small scale to establish who is strongest in communication so i can ramble about it. I think I'm onto something but I don't, like, actually know.
("Confidence-establishing and assertive behaviors" here defined as things that make people think you are confident and/or assertive, ie: firm handshake, eye contact, appropriate tone of voice, squared shoulders and chest-up posture. There are more.)