Santa's Elves don't make this unique brand of crap.  
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Mashed Potato Volcano
I never saw the movie Close Encounters.  I vaguely remember the little song the aliens played, but I failed to take in the movie.  I did read the Mad Magazine adaptation of the movie.  I didn't get any of the jokes because I didn't see the film.  Too bad, I bet it was pretty funny.

My lack of movie watching didn't keep Close Encounters from inspiring this little gem.  It is a mashed potato volcano.  I added a few touches that Michael Dreyfus didn't consider.  Here are a couple of photos.  

I put up two photos because I am unsure if the Nickelodeon folks will have a shit-fit over my use of Dora the Explorer in this next photo.  

Either way, making a mashed potato volcano was fun, festive and was enjoyed immensely by our dinner guests.  No special tools were required.  (That is Broccoli for bushes and the ground is made of stuffing).