I was going to say spider or rat.

It would be pretty easy to make either out of paper maché and fake fur, and you could even get a little battery operated light for the eyes. Velcro the body on top of the Roomba, and you've got a pretty nifty prop!

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I'm a Halloween Bride! 10/31/2002

Where there is no imagination there is no horror.
~Sir Arthur Conan Doyle