Something terribly bad can be extremely effective

Yes, I know, it sounds like a complete contradiction. But it's true in this case. An effective way to make sure someone learns a lesson is making that person go through the consequences of not using the knowledge that you are trying to convey.

I found the World's worst website and indeed I believe that its claim is true: It is are horrible!

The interesting point about this website is that it outlines everything that could go wrong in designing an Internet site by just... doing it! It's probably the best way to get your point across. It's also interesting to see the concise explanation of each common mistake and how to avoid it.

I particularly enjoyed the second, third and forth paragraphs about font colors and background. I laughed off laud while trying to read the almost unreadable text while trying to mute the annoying music.    

I like this site because it's a humorous and clear way of learning about Visual Design. It's funny to say it, but it's very well designed for the message and feeling it wants to create in the visitor. When you are surfing though it, you truly feel claustrophobic and becomes obvious that the design is completely wrong. However you want to keep on reading, because it's just amusing to think that there are people out there (some of them possibly your clients) who think that this design ideas are good.

The terribly bad, can be, under certain circumstances, good.

Juan