It's Saturday morning and you're feeling great. Not much to do except relax with a good book, or perhaps meet some friends for coffee at your favourite local joint. A knock at the door, however, interrupts your daydream. It is the knock of someone with much experience knocking. You peer through the window and see two men in suits, small black Bibles in hand. "Oh Christ!" you mutter to yourself, probably without pun intended, as you frantically debate how best to deal with these religious door-to-door salesmen.