Today, while I was working on setting up an Amazon Associates aShop, I found out that my webhosting company (IX Webhosting) has a default 404 page enabled for all domains you add to your hosting package. This page contains ads, designed to make money for their own gain. On that same add page, it says "<yourdomain> favorites: <keywords>". In my case, there were some sexually tinted keywords there. I think this is highly inappropriate and set up different 404 behavior immediately.

If you have an IX Webhosting account, be sure to check this out for yourself and change it as fast as possible, as this has such a negative influence in case some of your visitors would came to see it.