Karen demanded to be moved to first class but was denied by the flight crew. “I have a right to better service!” she screeched. The flight attendant maintained a calm demeanor. “I’m sorry, ma’am, but all seats are occupied.” Karen’s face turned red with frustration. “This is unacceptable!” she shouted, but it was clear she was not getting what she wanted. The rest of the cabin seemed to exhale collectively, weary of her demands.