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Nasty interaction between ASP.NET MVC Routing and my login system
public class HomeController : Controller {
    [CustomAuthorize] // My custom authorization tag
    public ActionResult Index() {
        // ...
    }
}

public class MvcApplication : HttpApplication {
    public static void RegisterGlobalFilters(GlobalFilterCollection filters) {
        filters.Add(new HandleErrorAttribute());
    }

    public static void RegisterRoutes(RouteCollection routes) {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );
    }

    private void Application_Start() {
        AreaRegistration.RegisterAllAreas();

        RegisterGlobalFilters(GlobalFilters.Filters);
        RegisterRoutes(RouteTable.Routes);
    }
}