This Karen is upset that her husband can't pull out of his parking spot in their BMW 5 series, because an ambulance responding to a stabbing victim is blocking the way. "The world is not going to stop," she says, as if that justifies any of her actions. Her tantrum makes even less sense once you see that her car has more than enough room to back up safely.
Eventually, a police officer arrives and puts her in her place. "I'm not going to stay here for them," the Karen says. "You're going to stay here," the cop tells her. Once her husband steps out of the car he is able to calm her down, but the look on his face says it all. "Her husband was upset when he found out she wasn't the one stabbed," one comment says.
Harassing ambulance staff is illegal, so this Karen should consider herself lucky that her only consequence was the wait. As one comment puts it, "She's the type of person who would complain that someone bleeding out is staining the carpet."