The Most Useless Program EVER!
Ruby with Shoes, 110

Shoes.app{button('Close'){exit}
p=para
t=Time.now
animate{u=(t-Time.now).to_i+10
exit if u&lt;0
p.text=' '*u+?&lt;}}


Makes a little arrow that pushes a "Close" button. (Pushing the close button manually also closes the window.)