The Happy Green Idiots are strange, unexplained green things in "The Happy Little Elves Meet the Curious Bear Cub". They are seen frolicking by the Honey Pot that Bubbles fell into. It is unknown what they are, but Bubbles can be seen turning into one when he falls into the honey, implying that the elves turn into them if they fall into honey. They also look like the Space Mutants. It is possible that they're just drawn this way when not close up (in this case, the scene where Maggie enters the living room while Bart and Lisa are tied with ropes while watching the said movie).