Or on any aircraft!
Ha! I had that "loud alarm tone" happen on a Aeroflot flight from Turkey to SVO once - a very shrill "beeeeep beeeeeep beeeeep" coming from the forward cabin as the plane shuddered in a steep climb after take off. I thought my ticket was punched.
Still, the rain sounds were quite unexpected on this flight - it took me a few seconds to realize what it was.