Disclaimer: I don't own Star Trek: Voyager or any characters used here.
Author's Note: My muse is diabolical and this is the result. It's a triple drabble and is absolute nonsense.
It's a very well-kept secret that the Borg Queen is allergic to tuna. I had absolutely no idea that the Borg Queen had a food allergy, since the Borg don't eat; they get energy and any nourishment needed through their regeneration alcoves. But Seven of Nine, former Tertiary Adjunct of Unimatrix Zero One and current Astrometrics officer aboard the Federation Starship Voyager, is a lousy drunk and tends to spill secrets when she's had more than half a glass of wine. While that could be disastrous for Voyager should Seven ever drink around aliens, it proved fortuitous for us in the struggle against the Borg.
Seven proceeded to tell me what I'm going to tell you now, though it musn't go any further than us. If the Borg Queen finds out that I'm revealing this information, which she considers to be her biggest weakness, she'll be relentless in her pursuit of Voyager and I'm not keen on the idea of having to face the mottle-headed bimbo again.
The Queen, though allergic to tuna, can't resist the thought of a good ol' tuna sandwich. Seven isn't entirely sure why the matriarch of the mechanical demons has no self-control where tuna sandwiches are concerned (she thinks it's a flaw in the computer that makes every Queen susceptible to the craving), but the Queen can't say no. Unfortunately for her, she has a violently immediate anaphylactic reaction; her throat closes up, her blood pressure plummets, and not even Borg perfection can compensate for the total disintegration of her physical body. The resulting shock to the Hive mind is enough to take out the Collective, one drone at a Borg had three close calls with this problem before they realized that tuna needed to be a banned substance in the Queen's presence.