We were returning from a day trip to Beartooth and a few miles before we reached Cooke City we ran into this grizzly with a cub nearly her size. What followed was the best grizzly encounter I have ever had in all my trips to Yellowstone/Tetons.
Rounding a corner on the highway we came upon a very large pullout with these two large bears searching for food in the nearby field. Sometimes as near as 50 ft and never more then 50 yds away, we spent the next hour photographing them before they went into the nearby forest to take a nap. After 15-20 minutes of shooting around other passengers and as they were completely ignoring us, I opened the door on the far side of the car and stepped out to get a shot over the hood. A half dozen shutter clicks and momma bear raised her head and looked me straight in the eye. I don't claim to have any paranormal senses but I did get her message loud and clear. I immediately slid back into my seat then closed the door and momma went back to her search for morsels in the grass. A few moments later I repositioned the vehicle so those formerly on the far side had the better shot.
Although it was a very large pullout, there were never more then a half dozen cars stopped at any one time. Surprisingly everyone behaved themselves and kept the noise levels down and nobody, other then myself, did anything stupid. I can only assume that since this was an isolated area off the beaten path that most of the traffic was locals with few tourists. In retrospect, this was the high point of our trip as far as shooting wildlife is concerned.