happened to me once... (Score 1)

Once I was designing a web page for a company, and put all the company's competitors' names in the Meta tags. A few months later we got a nasty letter from one of the companies I'd named threatening legal action. Not wanting any trouble, I changed the tags accordingly.

While legally I don't think I did anything wrong, I still can't take the moral high ground here - I was trying to trick people into visiting a website they may not have been interested in.