Must be a slow news day, so...

I noticed 2 of my fellow F travelers hanging the DigEPlayer(circle R thingy) by jamming something in between the headrest & the seat in front of them, and hanging the support bar over the item, making for a perfect viewing screen height. One jammed a pen, another gave an extra fold to his emergency briefing card.

Is this A. common practice, B. acceptable

My initial reaction was "Why didn't I think of that?"

Your thoughts?