Oh, was it only you?
Why, are you still here?
What do I care about my boss?／((俗))To hell with my boss!
Who do you think I am?
Whatever is this?／〔混乱した状態〕What (on earth) is this mess?
What's up?／What's the matter?／What's happened?
What did you you say to me?
What did you say?
Let me see─what was it? I can't seem to remember.