If you look at any of the subpages under http://bui4ever.com/anime, you’ll find “Spoiler warning: Plot and/or ending details follow.”. How I did that was I used the Improved Include plugin and I created a template page with that Improved Include code hard coded in.
The Improved Include plugin takes any page you want from WordPress and interjects into another page. So what I did then was point it to a generic page I created. So that way I can change 1 page that will effect 5 or more pages.