- you think a song you're listening to would go perfect in one of the movies (it's happened many times.)
(Here are a few I think would be perfect: 1) "When The Day Met The Night" by Panic At The Disco, 2) "Crystalised" by the XX, 3) "Dog Days Are Over" by Florence & the Machine, 4) "One Red Thread" by Blind Pilot, and 5) "Microphone" by Coconut Records.)
2. - you get excited when you see the movie poster in a movie theater and all it says is "Eclipse"
3. - you have dreams about the characters.
Feel free to add on to how you know you're obsessed :)