Most of mine are on Asian carriers but.....the guy next to me trimming his chin hairs using two Hong Kong coins..click...click...click. The Vietnamese lady on a Shanghai to Hanoi flight who wanted me to be sure I knew she did not like me by staring at me for 3hours non- stop. The first time flyer seat mate who was sure that the pop down video screens on an A320 could act like a touch screen so he could change the movie 20x. The China eastern A310 flight attendant doing monitor duty on the bathroom as there was no door....A recent San Francisco to Shanghai flight on UAL the overhead leaked water for the entire 11 hour flight. The picture of the napkin and duct tape repair is epic. Then there was the BA flight several years ago where the plane had just returned from Moscow into LHR where I took same plane to Frankfurt....and was notified a week later that I was exposed to iridium or whatever the Russian spy used to kille the Russian guy in London..........