(source)

Click the button to trigger an unhandled exception on the server. This should redirect you to the Anthem home page.

There is really nothing fancy here, just:

<script runat="server">
    void Page_Error()
    { 
        Response.Redirect("http://anthem-dot-net.sourceforge.net/");
    }
</script>

You could also do this with the Anthem_Error function but doing it in Page_Error lets you do server-side processing like logging the error.