Talk to Cole in Skyhold. His dialog will at times refer to movie lines.

Unlockable	How to unlock
Fight Club	"There is no other man. He becomes the other man to the things he can't."
Soylent Green	"It's made of people."
Star Wars	"He didn't kill his father. He was his father."
Star Wars	Knight of the Old Republic	"He was their enemy the whole time, but she made him forget, so he could change."
The Sixth Sense	"He was dead the whole. He didn't know."