"Trick or Treat? Copyright My Gourd" doesn't rhyme and it does not scan, unlike the original threat, "Trick or Treat, Smell My Feet..." which, by the way, seems to me ought to be punctuated as a question.
Trust the highly creative people of the copyrightalliance to come up with something highly entertaining, seasonal, and copyright-related.
Writer Sydney Blitman discusses a question on every pumpkin carver's mind at this time of year: can I copyright my jack-o-lantern?
Follow the link to read a most excellent blog that deals with sketches, carvings, originality, fixation, mold and more...but not deer or bears.
All the best,