Peetas dad have gave Katniss cookies.
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As an act of rebellion against the capital, to show how wrong the Hunger Games are (making children kill each other for amusement).
Katniss thinks that the way the siblings (Cashmere and Gloss actually aren't twins), especially Cashmere act when they are interviewed is fake and unbelievable. But Haymitch explains to her that they are desperate to stop The Games. In general, Katniss sayd they are polite but cool, although she is somewhat annoyed when Cashmere insults her.
Act of Random Kindness. ARK
Katniss is unsure about how she truly feels about Peeta (what is real and what is part of their act) which upsets Peeta. Katniss tells Peeta that "[t]he closer we get to District Twelve, the more confused I get".
Katniss Everdeen puts her name in multiple times in the reaping in exchange for food in Catching Fire. This act is called tesserae in The Hunger Games series.