Bikelane to Heaven
She: Do you believe in a, or the, heaven?
He: Well, while I cannot prove it, I am relatively sure that such a place exists.
She: And why is that?
He: Well, there clearly is a hell and if that part of the story is true, then the other one might as well.
She: How do you know that a hell exists?
He: I used to go there every Monday morning.