* The Yule Ball Scene (Goblet of Fire): Watson has spoken about how uncomfortable she felt wearing the elaborate pink dress and navigating the large ballroom. She found it difficult to be the centre of attention and perform in front of so many people.
* The Mirror of Erised Scene (Sorcerer's Stone): This scene was emotionally challenging for Watson, as she had to portray Hermione's longing to see her parents.
* The Battle of Hogwarts (Deathly Hallows Part 2): This entire sequence was intense for the entire cast, and Watson has admitted to feeling physically and emotionally drained by the end of filming.
It's worth noting that Emma Watson has consistently praised the Harry Potter films and has expressed deep affection for the characters and the experience. However, she's also been honest about the challenges she faced while working on the series.