We're all familiar with viral videos — Gangnam Style, Rebecca Black's Friday — But viral audio? That's a much less common phenomenon.
One great example is public radio reporter Jeff Cohen's Two Little Girls Explain The Worst Haircut Ever. It told the tale of his two daughters, 5-year-old Sadie and 3-year-old Eva, and what happened when one of them gives the other a haircut. Cohen taped an interview with them about their story, which has now been turned into a picture book.