First one that comes to mind is in the first Transformers when Optimus Prime was first shown. I think it was opening day, so all the big time Transformers fans were going crazy.
Always liked this thread1. The Dark Knight Rises2. The Avengers3. The Hunger Games4. Mission Impossible: Ghost Protocol5. American Reunion6. Skyfall7. John Carter8. Snow White and the Huntsman9. The Adventures of Tintin: The Secret of the Unicorn10. The Muppets