Something just felt terribly familiar as I read about this Zig Zag Zog UFO Saucer ($30 at Kiddly Winks) -- bop the alien on the head and he zooms away, LEDs flashing, and then he zooms around the room, detecting obstacles and going around them and u-turning and stopping unexpectedly. Baby will sleep well at night after chasing this, sure... but then I finally figured it out.
This is a what happens when you let your cat's electronic mouse toy mate with your Roomba.
