Repeat After Me!

So, I went hiking the other day and found myself walking along and up a narrow pathway which led to a well-trampled and very wide ledge overlooking the most beautiful valley I have ever seen. Across the wide divide was a similar ledge. Like many others before me, I suppose, I couldn't resist the urge to shout... so I did! HELLO OVER THERE!! I bellowed and in no time at all my call reverberated almost as loudly HELLO OVER THERE! then again and again and again and again and again and again and again and again and again and again...