As cramped as airline seats can be, the obvious rule of thumb/arm/leg is not to allow parts of your body to stray into other passengers' space. It's all at a premium, and even the most basic encroachment can be a flight-ruining move (think about the constant battle of wits and elbows taking place over the middle arm rest, for instance). However, most personal space violations take place in adjoining seats - it takes real nerve and arrogance to enter the space in the seat row IN FRONT of you, as this rogue sock proves, much to everyone's disgust.
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