The trigger this episode is the rainstick.  I believe this rainstick has been in my house for at least 20-30 years - I'm thinking my parents either brought it home from a cruise or my mom from Mexico when she was doing a class project trip for her nursing bachelors degree in the 1990's.

I love the sound the rainstick makes.  I did a little tapping at the beginning but really just a few seconds.  The majority is just moving the stick back and forth so it makes the rain sound.

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