In Once (which many of you know I love), Guy (Glen Hansard) takes Girl (Marketa Irglova) for a ride on his father's motorcycle. They stop in a park and have a chat, during which she reveals that she's married but that her husband (and father of her daughter) has moved away.
Guy asks her how to say "Do you love him?" in Czech. She teaches him, and he repeats it back to her in Czech.
She pauses, looks at him for a moment, and says something in Czech. Then she walks away. Guy chases after, asking her what she said, and then they cut to the next scene.
I'm not sure why I never tried to figure out what she says, but I showed the movie to everyone in my family this week, and James and Angela had the clever idea to go online to look it up. (I guess I should throw in a SPOILER alert here)
What Marketa responds in Czech is, "No, it's you I love."
The movie makes sense even if you don't know what she says, but knowing is like the cherry on the hot fudge sundae.
[Finding out what she said reminded me of watching the YouTube video in which someone used audio analysis to try and decipher what Bill Murray whispers in Scarlett Johansson's ear at the end of Lost in Translation.]