But Hans is not a stranger.
5 seconds sound clip from the Frozen movie soundboard.
You can hear this line at 00:41:13 in the Blu-ray version of the movie.
Quote context
[...]
- Anyway, I got mad, and so she got mad, and then she tried to walk away, and I grabbed her glove...
- Hang on! You mean to tell me you got engaged to someone you just met that day?
- Didn't your parents ever warn you about strangers?
- Oh, yeah? What's his last name?
- Dreamy.
[...]