Usability can often be a pretty dry subject, doesn't mean we can't have some fun with it.

Error messages are an important part of good usability and conversion. In a perfect world we wouldn't need error messages, but we do...

When crafting error messages, recognize that it is the program or web sites failure if an error message is required so we recommend you be conciliatory and apologetic if you want your confused and upset user to stay with your site and on a buy path.

However late at night we sometimes have some fun with alternatives. Enjoy.