One pattern that I consider "dark", but don't see in this list, is using loaded options on a dialog box. One that I often see in apps is like:

    Rate our app!  
    <OK> <Not Yet>  

Those really get under my skin because the developer is clearly trying to play a psychological trick on me, but it's so brazen and obvious that it just pisses me off. And bigger companies do it too (e.g. Google).