Apps/Games with a "Wow" Factor

[eraser]

There are several thread around about best apps or games.

I was wondering what apps that, although not necessarily useful, are impressive to see.

Apps that would make an iPhone user jealous, for example

 

[sohc sti]

i think the whole widget factor would make them jealous. i love the fact that i can check the weather and see how many apps i have running, in one glance.