I honestly think it's one of the most organic lines in the game! I mean, sure, it would've been really cool to give her a Die Hard-esque quip or one-liner, but who among us doesn't know that one friend who botched a line which could've sounded a lot cooler than it ended up?
To me, it adds to the feeling of really getting to know the characters, it's as though they open up enough to let their guard down even in terms of small details, like we're really becoming friends.