Thank you, anon.
Baker, deleted /pf/ Q post
Incorrect. I have flown a lot. "Seat back(s) and tray tables are" in the upright position for landing. Seat back is a compound. It is the noun. "Are" is the verb.
They all have it.
Idk friend. I think (mostly, anyway) that it's an artifact of trauma. It looks to me like they've suffered strokes or palsy. It's easy to say, and may be somewhat accurate, that it's the split in their personalities– but I think more likely it's a physiological manifestation of trauma endured.
The left-right variation is most intriguing to me.