Do's
Smile
Sit straight
Compliment interviewer on their outfit
Speak clearly
Compliment interviewer on their sick haircut
Be prepared
Compliment interviewer on the family pictures on their desk (ie. Your family is gorgeous!!!!)
"Accidentally" drop a $10 bill when you get up to leave. (it will be worth it in the end)
Tell interviewer your story about that one time when you saved a baby walrus from a pack of vicious wolves using only your bare hands and cunning brains. If it was just a dream don't bother mentioning it because the dream felt so real that it basically did happen.
Tuck your shirt in!
Don't
TALK REALLY LOUD
Show signs of any weaknesses you may have.
Answer a call in the middle of the interview
Text in the middle of the interview
Be nervous
Use hand sanitizer after shaking hands
Sneeze without covering your mouth
Try to crack a joke unless you're really funny
Cry
