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According to the video's description on YouTube, the people who shot the video were coming back from a hike in Hetch Hetchy when these cubs stopped traffic. Another bear, presumably the mother, is ahead, probably waiting for these youngsters to quit horsing around.
At one point in the video, we hear a man say, "I want one." Yeah, we do too.
Not all bear interactions are this enjoyable, and a number of people have recently been attacked by bears, raising questions over whether humans should be intruding on bear habitats.