turn off motion smoothing/interpolation/acquo-motion/etc. If you google the TV model and soap-opera effect, you should be able to find the label your TV uses.

I watched the movie Lincoln on a TV that was SOE'ing like crazy. It looked like a school play viewed through binoculars.
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I really wanted to go to that Bukake because I thought for sure that you were going to be on the receiving end. - Ryan Knox to Jeff Steward