Back in the "Dark" Ages when I got my drivers license, my 1st. car was a 1963 Dodge 880 convertible, with a "Push Button" automatic transmission. I discovered that by simply pushing the reverse button about 1/2 way, it would illuminate the back up lights (that sat about eye level with the top of the trunk lid.
When ever somebody came up behind me with their brights on, I'd just tap the reverse lights a couple of times and they almost always got the message.
If that didn't work, at the next traffic light (when they stopped behind me,) I would hold the reverse button 1/2 way down, then brake torque the car enough to break the tires loose and they'd start smoking. The guy behind me would instantly start laying on his horn thinking I was going to smash into him when I let off the break. But when the light turned green, I'd launch across the intersection and put some distance between us. After that, they usually kept their distance.