SITUATIONS OF SOCIAL UNCERTAINTY!

What do I do when...?
  1. You cough
    I so want to say "Bless you," but can't.
  2. I make eye contact with you, the door is closing behind me, but you're like 10 yards away.
    Sorry I didn't get the door, but holding that long for you kind of makes me look creepy.
  3. We've already said goodbye but then we see each other again.
    Do the goodbyes all over again? Laugh awkwardly? Shout "I said GOODBYE!" trying to be funny but it comes off as way more intense than intended? Pretend not to actually see each other? Silent little wave and nod?
    Suggested by   @ladyprofessor
  4. You offer to get me a drink and I don't know whether you're going to pay for it or I should offer some money.
    Suggested by   @cordeliane