I think you probably did. I was making a right turn at a controlled intersection. Specifically, the dedicated right turn lane was controlled by a yield sign. I had slowed and was preparing to merge into the other lane, checked my blind spot over my shoulder, and found that there was a car in my blind spot, so I braked to let it pass me (since the yield sign gave it right of way). The car behind me failed to react to my breaking and rear-ended me.