I don't get what's with people slamming their brakes lately. Happened to me 2 times within the same week.
First time, I changed 2 lanes in a row, always checking my mirror and blindspot before the lane change. Pickup in front of me starts encrouching into my lane when he's half a car's length in front. I slow down, let him in, gave him a few blips of my high beams. He gives me the finger, speeds up about 10m and slams his brakes. Luckily no car beside me and I swerved to go around him.
Second time, DVP, I was on the left lane. Beater car tries to overtake someone and comes into my lane. He doesn't speed up, I almost rammed up his rear. Gave him a few blips again to get him to go faster. Slams his brakes. I braked pretty close to him, he speeds up again. SLAMS it again, almost to a stop. Doesn't go back into the middle lane when he's passed the other guy. I just went around him and gave him the finger....