So in last week's episode of Chucky
they had a few scenes with mid-80s Charles Lee Ray, and I assumed they had digitally de-aged Brad Dourif for it... but no. It was Fiona Dourif in prosthetics! Practical effects are the best.
What an amazing family business they have.
Update: Fangoria: FX Artists François Dagenais And Tenille Shockey On Fiona Dourif's Mind-Blowing Transformation
One night, Fiona decided to take her Charles Lee Ray makeup for a "test drive" and went out to a bar while still under full prosthetics.[...] "Fiona decided to hit on the waitress as 'Charles' to try it out."