You ARE the weakest link. Goodbye!

When the The Weakest Link was first broadcast, Anne Robinson slowly developed this phrase and practised it until the point where it would reduce the failed contestants to tears. It was filled with scorn and and contempt. In the end, so many people complained that she had to stop saying it like that and just use it half heartedly. (mumble mumble mumble)

This is also a good phrase to use as a put down or come back, having been heard at Prime Minister's Question Time (thanks Heyoka) You can just say the first part as an insult or put it all together.
I particularly like using her way of saying goodbye when talking to my letting agency over the phone to make another complaint. This is an excellent way of showing your complete superiority over someone else.