Usually, using a software package's help system is pretty safe. You can normally rest assured that your work is safe and untouched while you browse different help options. However with MacOSX, some of the help subjects under the main menu launch the menuitem you are researching. This means that if you have a bunch of text selected in Pages and search for how to do a Table of Contents, the first item that shows up will actually insert a Table of Contents where the text selection is... essentially overwriting your text if you are not careful.

Fortunately, these autostart items are marked "Menu Items" in their heading to give you a hint that they are not in fact help text.

Tags: Software