The Hitchhikers Guide has this to say about Blue Police Telephone Boxes:
If you ever see one, it’s very probably a good idea to get off the planet as soon as possible, if not earlier. The seasoned traveller generally regards them as the worst omen of impending planetary upheaval. Governments overthrown, tyrants toppled and so on. If you happen to resemble a mechanical pepperpot you are strongly urged to keep clear at all costs.
*snerks some more*
And while we're at it - Romance Novel covers.