I Don't Even Know

My great-grandfather used to tell me, "Don't chase after Giant Sand Worms because you'll only end up with a shovel in your butt." I never quite understood his advice until one Easter, I was gardening with my best friend Patty. All of a sudden, we found an underground tunnel! It was stanky and spooky sounds came from deep within. Patty saw something interesting inside, jumped in, and I never saw her again. Great-granddaddy was right!