Occasionally, I find a funny JS code in douban.fm.
window.console && window.console.info("hello world");
If you load douban.fm page with console or firebug or anything like it, you will find funny infomation written by douban.
You could trace it and locate it in _init_.js file line 16, and then you will understand it.
It’s really funny, maybe sometimes I could use it in my project which open to public.