In a franchise that is filled with antagonists and otherworldly creatures brought to life through prosthetics and incredible make-up, unfortunately, Professor Lupin's wolfish other side isn't one of them. David Thewlis revealed on "This Morning" that even though a pixelated version of Lupin's beastly form was used in the final cut, there was a much more monstrous first attempt. "It was prosthetics when we shot it, but we shot it in such a way that was considered a little too scary for the kids, and I think it was done in CGI in the end," he explained.

Going into more detail about what kind of shape-shifting was considered that we didn't get to see, the former Defense Against the Dark Arts teacher added, "Originally, I used to have blood in my cheeks that poured out of my cheeks, and I threw up." Lovely stuff. While it might have been wiser not to mentally scar youngsters in theaters thanks to the change they didn't get to see, the transformation we ended up getting still came with a downside when working on set.