I saw this comic ages ago and it's always stuck with me everytime I watch a Trek episode. Anytime a crewman makes some metaphor it always ends up like this. Title is in reference to it happening in Subspace Rhapsody.
Crew is all in the ready room talking about how they sang. Spock shows the little graphic of the Enterprise going along opening space like a zipper. Pelia says "It looks like a zipper. This begs the question, might it function like a zipper?" Pike says basically the same thing and then Spock says "Potentially. If we combined shield harmonics with the Heisenberg compensator. You'd have to connect both to the deflector array and generate a beam."
From Zipper.
That's true. You're either already using the right polarity, or you're not. 50/50