In the Book Catching Fire

I think Cinnas act was the most defiant because Snow only wanted Katniss to wear the wedding dress in the interview and Cinna turned it into a bird that was used to spy on the districts and the districts turned it on them. And it is a sign of rebellion. Katniss wanted to break through the smug of those who us their brains to find amusing ways to kill to make them realize that while they were vulnerable to the capitols actions they are as well. Peeta says that him and Katniss are married and have a kid on the way. This is defiant because it was in front of millions of people and the people that like the games even thought it was barbaric and the capitols people started yelling, shrieking, calling for help because they realize how bad the games are. The tributes remind the capitols citizens that they are going to be killed. This is defiant because they are turning the capitol against Snow and the games. Cinna turns the dress that Snow requested into a mocking jay, its defiant because a mocking jay is a sign of rebellion.