I was just watching Halloween, and I've always been wondering, why does Ethan use a statue of Ianus to worship Khaos/Chaos? Seen as he's talking latin, I assume we're thinking in terms of the ancient Romans, however, Chaos is Greek, and it's an it, not a being. It's like what was there shortly after the Big Bang (Or before God created the earth, whatever you like) and from it the first Gods were created. I can imaine that if you're praying to something, you want something to pray to, so I can see the use of the statuette (or bust or whatever it was) but why Ianus? He's quite the opposite of Chaos:
In general, Janus was the patron of concrete and abstract beginnings, such the religion and the Gods themselves, of the world[6] and the human life[7], of new historical ages, economical enterprises. He was also the God of the home entrance (ianua), gates, bridges and covered and arcaded passages (iani).
He was frequently used to symbolize change and transitions such as the progression of past to future, of one condition to another, of one vision to another, the growing up of young people, and of one universe to another. He was also known as the figure representing time because he could see into the past with one face and into the future with the other. Hence, Janus was worshipped at the beginnings of the harvest and planting times, as well as marriages, births and other beginnings. He was representative of the middle ground between barbarity and civilization, rural country and urban cities, and youth and adulthood.
Also, we owe him the word janitor. (kudos to Wikipedia)
Finally, but that's just me being an Ancient Greek nerd (Stephen Fry would be proud), Xάος (Chaos/Khaos) did NOT mean chaos. It meant just what the Greeks assumed it was, a 'gaping void' empty, dark, but really quite orderly (derived from the word χαίνω (Chainoo/Khainoo), which means to gape, to be open etc.) Misunderstanding or misreading of Ovid (I think) resulted in it's new meaning of disorder (which, in Greek, is in fact ταραχή (Tarachè/Tarakhè))