This one requires a bit of explanation.
Three lane section of i93 southbound. I am in the rightmost lane. There is a truck of some sort directly ahead of me, in the rightmost lane. There is a Pathfinder in the center lane, several car lengths behind me. I have put my left turn signal on with the intent of pulling to the middle lane to pass the truck on front of me. All is well.
From behind a huge snowbank on the right, a sedan suddenly appears in the on-ramp, merging into the Interstate. The truck in front of me immediately signals and moves to the center lane to make room for him. This blocks the path I'd intended to take.
I brake hard to allow the sedan to merge in front of me, forgetting that my left turn signal is on, but I stay in my lane. Out of the corner of my eye in my mirrors I see the Pathfinder behind me signal and duck into the leftmost lane. He saw me braking with my turn signal on and took pre-emptive evasive action, although I was fine where I was and didn't change lanes.
There was never any danger and no one did anything stupid. I just wanted to applaud the heads-up driving on the part of the Pathfinder. So...
Dear Pathfinder Driver,
Thank you for being an attentive driver. I wish there were more like you.