T5J8F8 said: I could imagine having my hands behind my head and my arms against my chest.
It's probably really rare, though. Didn't see any in the first 10 pages and I'm not sure we'd even need to tag it arms_behind_head if it were such a pose.
Then there's the technicalities of being upside-down...
In that case we either wouldn't tag those with arms_up / arms_behind_head, or would just accept it as close enough.
