OMG So Cool! It takes just 6 years to get 4,000 birds at your place, starting just from 2 birds. All birds act the same, if you have ever feed pigeons. They always get more birds to come after you feed just 1 of them.
Harry Potter An The Goblet Of Fire is the first "Scary" movie of the series, due to the fact that it is rated "M". I find this quite interesting, as it has a lot of twists. This movie is about Harry Potter entering the Triwizard Tournament, which he and 3 other Champions compete, all from different wizarding schools.
Harry Potter and the Half Blood Prince is probably one of the scariest films, and is also the 6th/2nd to last movie/book. This movie has A LOT of twists, and I think it is the 2nd to saddest. This part of Harry Potter's journey to defeat Voldemort is quite vital, as it holds valuable info for his quest to defeat Voldemort in the last/next film.