1. Write an article promoting your competitor's website. Use the exact content from one of their pages.
Then submit the articles to as many directories as you can with a link in the resource box to your competitors website.
The duplicate content linking to their website will get it banned from the search engines for good.
2. Outsource the creation of free blogs and insert duplicate content in them linking to your competitor's website. Create as many of these as possible and it should penalize the website and delist it from the online world.
**I guarantee that these 2 methods work**
Nearly all internet marketers have stated these as facts so it goes without saying that these 2 methods have been tested thoroughly.
EDIT: This is a joke poking fun at everyone believing the myth about duplicate content etc...
No the methods won't work. Google will not de-list your website otherwise it would be easy for anyone to maliciously target a website.