Once from YVR-HKG, when I had paid for 18A, a woman came aboard and asked if I could change seats with her husband in 23K. Uh, no.

She said, its still the window seat! Uh no. Then she huffed and puffed and mumbled about people are ungrateful...

Then she decided to change seats with the guy next to her husband who obliged. Funny thing was that my friend was in 31H (emergency exit row) and we had planned on sitting together.. so I asked the nice man if he would mind switching with my friend, who was at the exit row. He obliged nicely...

So my friend and I sat together in 18AB! ^

Saw the couple at HK immigration giving me the evil eye !