One of my favorite parts of "The Killing Game" involved Seven's singing:
Hirogen: "Sing."
7: "I will not."
Hirogen: "Sing," drawing his pistol and aiming it at her, "or you will die."
7: "Then I'll die."
Tuvok: "Seven, you're a valued member of this crew. The logical response would be to grant his request."
7: "Logic is irrelevant." to Hirogen: "One day the Borg will assimilate your species despite your arrogance. When that moment arrives, remember me."