I think this would be for when your by yourself.
I would do that same thing with whoever was on that seat. One more question for you, what are the cup holders from, car, company, etc.? I'm assuming you just added the brackets, but since I don't know I have to ask. It is pretty creative though. And I like that last part of your sentence there...never even crossed my mind until I read that for the third time.
Yeah I kind of figured it was just something that was from another car.