Impossible? No, just unlikely.
The fairly long All For One One For All ambigram displayed to the left certainly catches your eye with the way the letters come together.
As you can see this design reads 'All For One' when upright and reads 'One For All' when upside-down.
Simply mouse over the design to see it rotate.
All items in the FlipScript store are already displaying the All For One One For All ambigram. To see them, use the menu bar at the top to navigate to an item and you will see every product in that category personalized with the All For One One For All ambigram. You can change the design at any time with the 'Create New Ambigram' button on the top of this page.