Love both movies Oh my god I watched The Hunger Games and Catching Fire before I saw Frozen and when I did see the part where Kristoff says "That is Mahogany" I'm like "OH MY GOD IT'S THE HUNGER GAMES." But I never realized the other similarities.
I think this all the time. Try going in pitch black with a picher of water, a flashlight, and a bowl. As you pour the water in to the bowl shine the flashlight across the water. It will move sightly with the light.