Actually, you can use the fact that one person is upside down to your advantage at times.
For example, there are a number of shooter type games that run vertically that will play 2 people at the same time (as opposed to alternating turns).
You can reconfigure the player 2 controls to control the player relative to the angle that they're looking at the screen. (basically reconfigure the left for right and right for left)
That way both can play those types of games at the same time. One person just has to view the game in a different manner.
Just a random thought! And there's no such thing as a stupid question!

Word.
Smack