Traveling north on interstate 81 between moosic and scranton exits. Tailgating multiple cars in passing lane. Switching to the right lane to pass them, then cutting them off to return back to the left lane. Almost ran one car right off the road causing drivers behind that person to quickly react and engage their brakes. Reckless driver was also yelling obscenities out of his window and appeared possibly intoxicated evidenced by the amount of swerving he was doing.