ASP.net MVC Global Filtering

This is sort of a broad question, but one I am curious about.

What are some examples of uses for MVC Global filters? I.E.

 public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
    开发者_JAVA技巧    filters.Add(new HandleErrorAttribute());
        filters.Add(new CustomFilterAttribute());
    }

I have seen many examples of stopwatches which while perfectly legitimate, lacks much real use.

I have also seen a few logging examples which is good, but I was wondering if anyone has any other thoughts on what to implement them for, or places you have used them.

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Most importantly in my opinion is security. You can have security applied to everything by default using a global action filter.

Global injecting of content - html or headers for example.