Here's an extreme, yet very real example: mandatory Doxygen comments on accessors:

  /**
   * Get the foo
   *
   * @return the foo
   */
  int getFoo();

  /**
   * Get the bar
   *
   * @return the bar
   */
  float getBar();

  /**
   * Set the foo
   *
   * @param foo the foo
   */
  void setFoo(int foo);

  /**
   * Set the bar
   *
   * @param bar  the bar
   */
  void setBar(float bar);

Compare with what any sane project would do:

  int   getFoo();
  float getBar();

  void setFoo(int   foo);
  void setBar(float bar);

Multiply that by a dozen such attributes, and what should fit on a single screen spans now hundreds of lines. What you could see at a glance, you have to search for. There's simply no way those utterly redundant comments increase readability. (Yes, the real comments in the real code were just as redundant.)

LOC is more valid as a metric than most care to admit.