Does Delta Pipe-In Rainsounds Midflight?

During the Delta airline flight I rode yesterday, I could swear that in the middle of it they started piping in the sound of a rainstorm. It sounded like one of those Amazon rain forest soundmakers, you know, the ones where it’s a piece of tree limb and you turn it upside down and the beads inside make a pleasant rain sound. Then again, I was sitting pretty far in the back, so maybe it was just the sound of the head emptying. Unfortunately I don’t suffer from synaesthesia and my auditory faculties don’t interfere with my olfactory ones.