Insane Kid's wacky dreams

Just recently recalled a very small chunk of a dream I had. For some reason I was "watching a movie" about this really annoying kid that raised a worm that grew into a huge pet about 10 or so feet tall, and over 100 feet long. Something about him riding the worm, then getting smacked by a tree and falling off as the worm escaped or something. Very vague, just came back to me late in the day.