11) YouTube speech bubbles

If there's one thing we've learned in the four year history of YouTube, it's that literacy cannot be presumed. So while the "annotations" feature launched last year should allow filmmakers to produce richer videos, in practice it has led to clips being marred by intrusive gibberish. The equivalent of an excitable child forcing his parents to sit through his favourite cartoon: "Dad, did you see that bit? Did you see it? It was funny, huh? Oh Dad, you weren't paying attention."