Don't throw rocks

So, we get to the waterfall after an extensive hour climb to see the beautiful moss covered cliff and my host-sister, Jesse, starts throwing rocks at the moss to knock it off! The entire reason that this is called Upayaco is because the moss hushes the sound of the water falling, how about we not throw rocks at it?

Unfortunately, my well meaning and logical explanation / plea wasn't working.

So, new strategy: whenever Jesse threw a rock at the waterfall, I threw a rock at her! After a while, it worked out quite nicely.

Then, Marlene started throwing rocks at the waterfall and Jesse looked at me contemptously. So, I started throwing rocks at her to.

It worked.