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I know, saw a few myself. Even found myself doing the head bob towards the KB at one point. Don't you wish you could just pick them up, and carry them away to sleep, in at a sweet location around the track, somewhere!
The best gag I ever saw on this was someone created a table and a bowl, and moved it so the AFK person was face down in the bowl. I recall they also had a box of cereal next to the bowl as well. Was quite silly to see.