I get really annoyed with TV presenters who wave their hands about when they do a piece to camera. I'd like to know is it their natural way of talking or does some crazy director tell them to move their hands up and down in time with every syllable? Watch Piers Taylor on 'World's Most Extraordinary Homes' to see really bad (or good) example.
There was a joke about an Italian chap who was accused of some crime. Only when he appeared in court did he give his alibi. When the judge asked why he had said nothing until the last minute, he explained, waving his hands about, "Well-a, until now, I had handcuffs on, innit?"
I think it's the kind of behaviour they're trained to do in front of a camera, so they don't look too stiff and awkward. Some presenters can make it look more natural than others. Some go a bit over the top.