Scribblenauts Easter Egg - 5thcell Developers

Whenever in game or at the Start menu: spawn a Teleporter and 'ride' it.
This could take you to a few different places, but more common than all it will take you to 5thCell Studios. There you can walk amongst all the Developers of the game.

Listed here:

Jeramiah Slaczka
Marius Fahlbusch
Matt Cox
Edison Yan
David J Franco
Joshua Billeaudeau

And one unknown Lady named "Liz" who is already a zombie.
Also, if you wait around long enough they will all turn into Zombie women just like Liz.