intertext

It's a comedy series called "Extras". Ricky Gervais plays a struggling extra desperate to get a speaking part - though by the second series he had become a minor celebrity due to starring in a dire sitcom. In each half hour episode, there's a major guest star, who always appears as a very unflattering version of themselves. It's very funny, but very cringeworthy and often hard to watch.

I think Daniel Radcliffe's appearance was my favourite.

http://www.youtube.com/watch?v=8PhSe1JZD1g