Let's say it's a spinning back kick. Keep your arms up, move straight into him while he's turning, take his back.
You keep your hands up just in case it's a spinning backfist--so while you move in you cover your right side if he's spinning cw, and you cover your left side if he's spinning ccw. Take his back anyway.
Another technique that I used to practice a lot was jamming. If someone is attempting to use a spinning kick, you can stop kick him in the thigh before the kick is launched. That is--assuming you know your opponent at this point and can catch it.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."