The face and your body language are really the most important part, I think. People are really really easy to trick, not because they are stupid, but just because they ... are. I think in regular conversations their brains just don't have time to fact check everything so a lot of stuff is accepted without question and you can start using that to erode their confidence in EVERYTHING THEY THINK IS TRUE and yeah you can go from there.

And my wording up there makes it seem like I AM EXEMPT FROM THIS but I am totally not.