Here's a fun simple one by yours truly (in Javascript so you can run it right now): javascript:(function(){s=x=' ';for($=_=1;$<1000;$+=_+=$)x+=_+s+$+s;alert

Here's a fun simple one by yours truly (in Javascript so you can run it right now): javascript:(function(){s=x=' ';for($=_=1;$<1000;$+=_+=$)x+=_+s+$+s;alert(x)})()