If you think someone is lying, look at them and say nothing.
If someone insults you, pause for a second, look at them, and ask ‘Are you okay?’
When you want to ask for a favour, start with ‘I really need your help’. People don’t like the guilt of not helping someone out.
If you’re in an argument, don’t scream, stay calm. It gives the other person the impression that you are winning.
Edit: Try to appreciate other's work. So upvote..