Use the brake lights early and often. Drive defensively.
I was behind a driver that did that. Brake lights came on at random intervals between 1-4 seconds for no apparent reason.
Tired of being behind them with their needless brake application, I got in front of them, and did the same thing, applied my brake at random intervals for no apparent reason JUST LIKE THEY DID.
Oddly enough, they got fed up with being behind me and changed lanes.