The best is to find a nice slow-moving semi and get alongside them as if you are going to pass. Then just match speed for a good 5-10 miles until your amusement is so great you can't stand it and the guy behind you is plain livid and making all kinds of obscene gestures. I've once baited someone like this so badly they were looking for any way past me on a 2 laner. There was a police officer in the median on the other side of an overpass, somewhat hidden as they attempt to be, and I slowed from the 64 matched speed I was doing until the semi was actually pulling ahead. The guy behind me had enough and jerked his van out to the left of me onto the shoulder and floored it; I don't think he saw the cop. Well, about the time he was even with me he was concerned with flipping me off, etc., so I took opportunity to speed up a little and match his speed, causing him to gun it further. He sure was humbled when we went past the overpass and he was almost in the grass, I was innocently holding my own lane against a psycho. That's when I (fuoops) and kept going while the cherries popped and chased him down.
Another time I was heading to Rockford, IL out of Chicago and there are a bunch of spaced toll booths. Well, I was in my TBird and this Monte Carlo (the Ol' Boy model we've all seen endlessly) kept pacing me and wouldn't just bugger off. The toll booths go to 4 or 5 lanes then following them they taper down to 2. Well we sped out of there and I held the left lane, he the right; he must have thought he was going to 'show me' and cut me off before he got to a slow-moving semi in the right lane. I hadn't fully comitted so he was gaining well, then I saw the semi and pushed it down, determined not to let daddy ass-hat cut me off and have him look the fool. He must have really been a rare pisser; he pushed it too long and had no chance of getting ahead of me, he must have felt he could push the beater by will alone. Regardless, he failed triumphantly and hit his brakes too late, skidding up under the back bar of the semi that hangs down under the tail. He wasn't hurt, the car didn't get stuck or anything, just 'rrrrrrrrt' then 'crunch' then release and the nose was all crispy, lmao. He wouldn't look over at me as he began slowing and pulling to the side, just behind the semi who must've been thinking, "What in the F***?!"
Hehe. (angel)