It happened twice to me on my last trip. In almost all cases when this has happened to me, the offending driver comes across (often multiple lanes) from my left to get to an exit that he/she is about to miss. Because I try to leave a pretty good gap between me and the car in front of me, it's mistaken as an invitation to CUT ME OFF. When it gets really "interesting" is when the knucklehead realizes the exit lane to our right is unexpectedly stopped, full and unavailable. That's when he/she slams on the brakes and the "code brown" moment ensues. The last time it happened to me, it was a mom in a minivan full of kids. I honestly don't think she has a clue how close we all came to having a really bad day.
