Rockhold was clowning around, showing absolutely no respect for his opponent.
I don't care who you are, you're still only a man. Even if a non-fighter hits you correctly you will lose consciousness. Rogan said it best- "Rockhold seems to have this air of invincibility". Thought he was invincible, and literally looked down his nose at Bisping.
He would demolish Bisping in a rematch, but would I call this fight a fluke? Not at all. You do that, someone will KO you.
Lawler got caught. It happens. Could have happened to Woodley, we've seen it happen to Woodley. Is that a fluke? I don't know. There is always that risk. Anyone can get caught.
RDA got smashed hard, much less inclined to call that a fluke but I'd say it's the same general principle as Lawler's situation.
Aldo and Werdum, those weren't flukes, those were glaring flaws in performance.