The famous “What an excellent day for an exorcism…” scene, where Regan and Father Karras speak using foreign languages (Latin and French), translated with subtitles.

Regan:
“Mirabile dictu, don’t you agree?”
Wonderful to say, don’t you agree?

Father Karras:
“You speak Latin?”

Regan:
“Ego te absolvo.”
I absolve you.

Father Karras:
“Quod nomen mihi est?”
What is my name?

Regan:
“Bonjour.”
Hello.

Father Karras:
“Quod nomen mihi est?”
What is my name?

Regan:
“La plume de ma tante.”
The pen of my aunt.