We were cruising home from my inlaws yesterday afternoon, doing a sane 5 to 10 over the limit when we caught up to a Dodge Intrepid behind an Acura suv going about 10 under the limit of 45 on a twisty downhill stretch. I settled in because I knew there were several passing zones in a few miles. Soon the Acura was down to 25mph, no problem, it's a rad road with some impressive drop offs on the right. When we hit the river canyon at the bottom of the hill, traffic speeds up a bit, to 50 (in a 55 zone) and I pass the Dodge. As soon as I did, the Acura slows down to 40 through some easy bends. When we hit the straight away with a dashed yellow, the Acura floors it and I pace him up to 70 and he kept on to probably 80! I thought, maybe he woke up or something and figured out the road wasn't that windy now, but he slowed down to 40 again for the next set of bends. Crazy, I thought, so at the next passing zone, I dropped it a gear and went to pass but the ****weed floored it again and as I was next to him, he came into the lane I was in. I backed right off, barely keeping off of the far shoulder and watched as he drove down the middle of the road. At the next passing zone, he went right for the middle of the road again, speeding up for the straights and slowing way way down for the turns, at one point waiting until the last minute to pull out of oncoming traffic. After that, my wife said "pass this guy and let's get out of here". The next passing zone had a paved pullout on the far side, basically making the road three lanes wide. I dropped it down a gear and really got a jump, heading all the way over to the pullout. The guy still tried to block, but with the extra road and the big pile of horsepower I had, I was up next to him by the time he reacted. He flipped me off, blared his horn and tried to keep up with his brights on me after I passed. He had his whole family in the truck with him, too! For the life of me, I can't figure out what I did to set him off. Thanks for letting me rant, I needed to vent that.