I know the show you mean
There was a document I found on the Internet ages ago concerning this. It was written by a camera man who worked on the Uk show TFI Friday. In it he wrote that when they were taking a break from filming, just before Sarah was set to start her interview, he saw that she was lying flat on a couch and that her feet were bare, so he tickled them and she went crazy. That's all though. It wasn't even part of the show, so there won't be a clip of it. Shame...