At kottke, The Mull of Kintyre test:
The British Board of Film Classification was said to have an informal rule called the Mull of Kintyre test about the erectness of penises shown in films and videos. If a man's penis was at an angle greater than Scotland's Kintyre peninsula, you couldn't show it.
The BBFC would not permit the general release of a film or video if it depicted a phallus erect to the point that the angle it made from the vertical (the "angle of the dangle", as it was often known) was larger than that of the Mull of Kintyre, Argyll and Bute, on maps of Scotland.
The BBFC has denied the test was ever applied. Sometimes a Scottish peninsula is just a Scottish peninsula.