The quickest way to get over anybody is to follow them on Twitter. I used to like Pegg and Wright. Followed them on twitter, can't stand them now.
You'll have literally no choice. They'll see something on TV, or round at a friends house long before you can choose what to show them. I was lucky in that my oldest didn't show a spark of interest in anything until the Incredibles was on TV when she was about 1. She was mesmerised. I dug out my copy of Nemo and popped it on and she was hooked.
Since then I only try and allow "quality" (no Barbie, no fucking "Buddy" (talking puppy) movies, no knock offs) in the house, but she still gets other people to take her to Alvin and the Chipmunks or whatever.
Having said that, the first film I've ever seen her absolutely fall for, and be completely "no fidgeting at all" hooked by, was Hugo.