https://groups.google.com/forum/#!msg/vim_announce/KPqcD9MYiMk/T11rMwO1AAAJ
"Demo game
---------
To show what is possible with popup windows (and because I sometimes get
bored fixing bugs), I created a silly game. This uses popup windows that
move across the display, text properties to highlight the animals and
even sound to make it more fun! Thanks for my colleagues Greg, Martijn
and Shannon for making the silly sounds. You can find it on github:
https://github.com/vim/killersheep"