glow-in-the-dark paint
*jaw hits floor*
If that actually happened, I would be a very happy boy
I've lost count of the times that I've had to manipulate my Zaurus' screen in the dark so I could see the keys. Whilst I've gotten better at thumbtyping in the dark over the years it's still nothing like touchtyping on a full keyboard. (Admittedly in the dark I occasionally lose the home row on those too.










