This was going to be a serious grown-up blog, but instead it's just a bunch of reblogged tv gifs. SORRY.
I.e, this one:
Before shooting, Emma Watson acted out the scene, so Helena Bonham Carter could mimic her facial expressions during the actual filming.
This scene is Helena Bonham Carter,
pretending to be Emma Watson,
pretending to be Helena Bonham Carter,
pretending to be Hermione,
pretending to be Bellatrix.
AND IT WAS THE GREATEST ACTING I’VE EVER SEEN IN MY LIFE