My favorite ECH moment... from Workforce
EMH: I assumed I'd be in charge during your absence, Commander.
KIM: Excuse me?
EMH: An Emergency Command Hologram programmed with over two million tactical subroutines outranks an Ensign.
KIM: A few words to the computer and this Ensign can delete those subroutines.
EMH: Then you'd be depriving yourself of a skilled leader for the sake of your ego.
KIM: Oh, my ego.
CHAKOTAY: Gentlemen, work it out.
BOTH: Aye, sir.