Several years ago, traveling in paid first on CO, I was dressed very sloppily (t-shirt/shorts/flipflops) on a flight from IAH-FLL for vacation. As I was standing in line for boarding, this self-important woman cut in front of me while talking on her cell very rudely to who I assume was her assistant. Never an excuse me, or an apology, just cut right in. Well, imagine my surprise when I board to find her in my seat. Apparently, she'd been given an automatic upgrade as an elite member, but was assigned my seat. I told the FA she was in my seat and showed my BP showing I was in paid FC. The FA checked with the GA, who told the FA that the woman was given the seat in error. When the FA walked up to her to reseat her, the lady, still on the cell phone, wouldn't acknowledge the FA.
The FA looked at me with "the eyes" and a smirk and then leaned her face infront of the woman and said, "Ma'am, we're going to need to reseat you in the main cabin. You're in this gentleman's seat." The woman went nuts! (I can only imagine what the poor assistant was thinking on the other end of the phone!) After the woman's tirade was over, she ultimately took her seat in coach.
As she gathered her things to walk back, she made one last glare at me and I said, "Karma."