As we were driving along the roads at Yellowstone, we happened upon a bison crossing the road. This one was a smaller bison, but still, it probably had as much mass as our car.
The SUV folks in the opposite lane thought it would be ever so delightful to parallel the bison so that they could take video and still pictures out of their car's nearest open orifices. In other words, they were A) driving with their cameras, B) harassing the wildlife, and C) herding the bison into our car.
We encouraged them to move along. I'm still trying to decide if the "thanks" from the red SUV meant, "Thanks for getting that silver SUV to move along," "Thanks for getting that silver SUV to move so we could have our turn harassing the bison," or "Thanks for letting us be selfish jerks."