wow, weird, I had this same exact* conversation about 2 days ago with my son.
"Are there real robots in this world?"
"Sure. We have one. Roomba is a real robot. He cleans the floors."
"No. Not vaccuum cleaner robots. Robots with faces."
"Well, yes, there are-- but they mostly make them in Japan."
*replace Roomba with BB (who is my Robosapien, named after the robot from "Deadly Friend")