400th Question Celebration/Challenge

Python, FOUR HUNDRED bits

i=0
while 1:print" "*(i%8>3 and-i%4 or i%4),0;i+=1

At first I wanted to make a sine scroller, but there was no place for the import. Now you get a bugged triangle wave. ~~~party~~~

Brainf*ck

[-]>++++[<+++++++++++++>-]<.----..---------------.

And the output will be: 400!

Ruby

1.upto(side=gets.to_i){|i|puts (?**i).center side}

This creates a wobbling tree, like the following:

   *   
  **   
  ***  
 ****  
 ***** 
****** 
*******