Rothewell over Barnett, most unlikely submission victory ever?

I don't think lot of people thought Werdum would triangle Fedor and give him the first loss in a decade, though hindsight 20/20, some people may sing a different tune now, but after what Fedor did to Nog, and I'm fairly sure people do survive in Werdum's guard just fine, like Overeem did, if they are not reckless and go apeshit like Fedor did, I don't think lot of people thought Werdum would be the one to end Fedor's streak for 10 years with a triangle.

I am sure there have been cases of...

Rothewell over Barnett, most unlikely submission victory ever?