I was once travelling with EY in business, and was quietly enjoying the pre take off orange juice, when a really big woman (the kind that dont sit down, but rather get to a certain point and then let gravity take over) and she really smelled.
I thought "christ on a stick - I cant put up with this", and started a scan of the cabin to try and locate an empty bolt hole to move to. The lady looked at my juice, and this must have made her thirsty, because she opened up one of her "Tesco" carrier bags and produced a litre of pinapple juice, and started to swig from the carton (most went into the mouth, but some dribbled down the chins).
Cabin was filling up - so I was starting to get a sweat on, when a cc asked to see the ladies boarding card, and escorted her to her correct seat (42B) - Obviously I was relieved (took about an hour for the smell to dissapate though) but did feel sorry for anybody sitting in 42A or C