Usage: Upon having just met her, Jack asked Kate to sew up the wound in his side using thread and a needle from a travel-size sewing kit.
Kate: Any color preference?
Jack: No...just standard black.
Interpretation: The sewing kit offers itself as a ready-made metaphor that speaks of the unshakable bond sewn between Jack and Kate on the day of the crash. It is also a powerful symbol of how Jack, a man obsessed with "fixing", was for once able to let go and allow this woman he hardly knew do the fixing for him.
Usage: Be it a poignant confrontation or a quiet moment of mourning, rain is a device used on Lost to heighten intensely dramatic scenes.
Interpretation: Rain often pours over Jack and Kate as truths are revealed and intimacy reaches a high point. (Author's note: This is perhaps why many a Jater entertains fantasies of Jex in the rain...)
Jack: Oh, no, no, no, these are slimy little bluish-black thingies.
Kate: Guava seeds.
Jack: What's a garden without guava?
Interpretation: The gift of guava seeds mends Jack and Kate's friendship and reignite romantic sparks between them. They represent a sweet new beginning for the pairing. (Author's note: Guavas have since become the picker-upper fruit of Jaters.)
Usage: Jack and Kate find the black and white stones next to the bodies of Adam and Eve in the caves.
Interpretation: The black and white stones symbolize the contrast between light and dark and, one could extrapolate, between Jack and Kate. He is a well-to-do doctor, a hero, basically a good guy. Kate is a fugitive with a mysterious past, a runaway, a woman who thinks she is undeserving and inherently bad. And yet they are a set. They complete each other. (Author's note: since Locke says the black and white stones could represent Adam and Eve, a popular theory is floating around the Internet, to the effect that Jack and Kate themselves are those bodies sent back to the Island from the future. Yeah, I don't get it either.)
Usage: Following Jack's shoulder dislocation, Kate makes him a sling.
Kate: Made you something.
Jack: Awww. My first sling.
Interpretation: The sling shows how much Kate cares for Jack and instinctively plays nurse to him when he is wounded or sick (see also "The Greater Good" and "Something Nice Back Home"). It reveals Kate's strong maternal side as well.
Usage: Kate triggers one of Rousseau's doll traps, and she and Jack get "caught in a net".
Jack: We were caught in a net.
Sawyer: What the hell is that supposed to mean?
Jack: It means we got caught in a net.
Sawyer: Is that what they're calling it these days?
Interpretation: The physical proximity of being caught in a net together helps Jack and Kate dispell some of the underlying tension that has been building between them since "What Kate Did". The event probably is what triggers Kate to later apologize for kissing Jack.
Usage: Jack and Kate use walkie-talkies to communicate during the escape from Hydra island.
Jack: You remember what I told you on the beach? The day of the crash. You remember what story I told you when you were stitching me up? [Kate is silent on other end] DO YOU REMEMBER IT?!
Kate: [Crying] YES! Yes, I remember!
Jack: When you get safe, you radio me, and you tell me that story.
Interpretation: During those crucial and tense moments, the walkie-talkies are Jack and Kate's only mode of communication. They represent the hurt over being so far apart and, perhaps, separated forever. Jack and Kate share one of their most intense and intimate conversations to date over a walkie, seemingly oblivious to the many people standing around them and listening in. For a brief moment in time, they are the absolute centers of each other's worlds.
Usage: Kate suggestively licks her spoon clean and hands it over to Jack.
Jack: Erm, can I borrow that spoon?
Interpretation: The spoon represents Kate's sad attempt at winning back Jack's affections, as he spends each day more time with Juliet. The gesture itself is somewhat out of character for Kate, at least as far as Jack is concerned. It also speaks of the jealousy building up inside of her.
Usage: Kate tells Jack to eat crackers, to cure what he thinks is a stomach bug (but turns out to be an appendicitis).
Kate: What are those?
Jack: Antibiotics. I just got a... a stomach bug.
Kate: You should eat some crackers. Crackers always make me feel better.
Interpretation: Another one of Kate's desperate attempts to fix her relationship with Jack. Things have been awkward between the two ever since she got back from the barracks, but instead of facing with the problem head-on, she uses a silly pick-up line to let him know she still likes him. (Author's note: Stop avoiding, Kate!)
Usage: We first see Jack and Kate share a water bottle while talking to Daniel in "Confirmed Dead". The nonchalance and relatively intimate swapping of the water bottle continues in the first part of the finale, where Kate tells Jack she can tell when he's lying (in this case, about bleeding from his suture wound).
Kate: You know when most people are lying and they can't look you in the eye? You do the exact opposite.
Interpretation: Just like a gulp of water, these very short scenes are refreshing in the display of how well Kate knows Jack, down to his last nervous tic. (Author's note: swapping water bottles necessarily implies swapping spit, so these scene could also be Jack and Kate's symbolic way of necking. Ha.)