Speedy Self-Distraction Bleg

What do you do when somebody spoils a movie that you plan to see? Obviously, you want to do your utmost to downplay or outright forget what you just heard/read. But how can one do so?

I've tried thinking about other stuff, with little success. I've tried making my mind completely blank, during which my mental visual field did turn white, but something in my brain was still contemplating the new info. I've even tried pinching myself, which didn't work plus it kind of hurt. Is there anything that you all do that works? Perhaps I should look into propranolol pills...