Clarks Summit Panic is a nice font style that allows you to quickly give a scary, dripping, Halloween look to any text string.
The Clarks Summit Panic font will install via its built mechanism and will integrate quickly into your system. You can easily access the custom glyphs through any text editing application.
Mac OS X comes with pre installed font styles and Clarks Summit Panic will simply be added to your pre existent library, that can be managed through the Font Book application.
To learn more about dealing with the Font Book application you can easily access the Apple support page HERE.
NOTE: The Clarks Summit Panic font is free for personal use only.