Whaddyaknow I just stumbled upon this. For the scene in Gringotts with the polyjuice shenanigans, Emma Watson acted out the scene so that Helena Bonham Carter could see what Hermione's mannerisms would be like so that Helena Bonham Carter could act as Hermione acting as Bellatrix. Spoiler
I wake up to find out that apparently I am not into the orgies that I throw at my mansion. My head hurts.
I would make a joke here, but I've recently been making fun of another friend for constantly using sayings involving dildos, dicks, and asses and I don't want to be very hypocritical.