Yep, if their lights are too bright or their brights are on, I wait until we stop at a light and I fiddle with the side views trying to hit them in the face with the beam.

Coincidentally, when someone is driving too slow in the left lane on the highway and won't move right, I put my car as far left as I can in the lane so my headlights will be bright in their sideview until they move right again.