Forced their way into a non-existent gap in my lane, and then predictably, had to slam their brakes to make room for themselves, forcing me to hit the brakes too to avoid rear-ending them. They used their blinker, but that doesn't mean there is space nor give you the right to cut people off. Unintentional (but totally avoidable) brake check caused by impulsive lane change, poor foresight, and "I can't miss my turn" driving style.