I don't say, "I don't know" as much as I used to and I realize now that it often just means I don't have a preference of one thing over another.
What do you want to eat?
I don't know.
Well, do you want to go out or eat in?
I don't know.
Is there something you have a taste for?
I don't know.
Is there somewhere in particular you want to eat?
I don't know.
