Twitter has a Halloween surprise for its users. Just type #trick or #treat in the web interface and you will be treated with some Halloween Goodies.
Here is what I got when I typed #treat in the web interface.
Typing #trick displays this.
And if your not scared enough, the page will automatically refresh to show you some zombies when you type in #trick.
Happy Halloween to all the Techie buzzers, have fun and play #trick or #treat.