I got on my LCY-EDI last week to discover a guy in 2D (e190). He was supposed to be in 2A, but he had a gold tag dangling so I suspect he may have been chancing his arm. All very polite though.
On a Miami flight I went to the loo and found a tired and emotional person just settling down for a sleep in my seat when I came back, having thrown my stuff on the floor!