I have a lecturer who speaks well, delivers his points concisely, building with definite structure. And yet there's something distracting about him when you watch him speak. I figured it out the other day. It's because he uses hand gestures all the time. Not just one thump of the edge of his hand to make a point, but every word after that one in the sentence until he reaches the end of his point. It's distracting. It's numbing. Because eventually the emphasis just ceases to have any meaning at all.

See what I mean?