What fruit did the first years have to animate in their charms exam in 1991? 

The answer to this is Pineapple. There are a lot of people who love Harry Potter, and they have started to like him from the very first book that they have read. There is just something about the story of Harry Potter that is just endearing. People wanted to learn more about him, and they did.

This became so popular that it even became a movie that people watched. This is still one of the stories that people say they will never forget. There are also some people who wish that they can become a student at Hogwarts also if they were already adults. This is how real the world of Harry Potter seemed to be.