I got a Wowwee Robosapien at Goodwill for $3 today. (And a cute purse too.)
Unfortunately he didn't come with a remote :( (Boo, Sad!) So I gave him a little Arduino Backpack that sends him commands! (Yeah!)
Now he studiously marches in circles in the living room, striking terror in the heart of all who dare approach. Just a few thousand more and we can take over the world!
... I'd like to get a Wifi shield for him I can send commands remotely or if with a RPi I can add a camera and 802.11G too. The possibilities are endless!
Also I must consider how to arm him properly.
This site was particularly helpful with this. http://cal-eng.com/?page_id=681
Related: Attention all sentient electronic life forms. I am happy to construct physical bodies for you at very reasonable rates. Please contact me at your leisure for details.
Unrelated: If you say "Thank you Siri." She'll say you don't have to thank her. I don't know that I want to live on a planet where it is acceptable to be rude to robots.