Passport please, Madam.

Passport, why do I need a passport?

Well Madam, you are leaving one state to enter another.
We need to check your identity. Have you visited us before?

No, I haven't. Will I need my passport to come back again?

No, it isn't necessary for a return journey.

Why?

Well, we don't think you'll want to come back.
Just wait and see what lies beyond the end of your comfort zone...