Text anomaly: "sine wave"?

This is an interesting "right ragged" text anomaly I noticed while typesetting part of a new design. In all my years of setting type, I would have to say that I never noticed a "sine wave" or anything else so complete in terms of an indentifiable shape in a very finite block of text. Unless you set type, you might not get to excited but consider:

• The text reads perfectly (it wasn't massaged to make this happen)
• It's just sitting in a box and it a complete thought
• Completely un-premeditated (is that word?)
  

So, I wonder what the odds are of a seeing a perfectly identifiable shape in a finite block of text? Well, unless you set type for a living, you will probably ask nor care to answer that question.