"We were launching the boxed set of Dvds and there were thousands of fabulous people, mostly kids... and there was a lady who said, 'Will you sign my breasts?' and I said, 'There's a lot of kids around here,' and she said, 'I have eight kids'. I said, 'Well, what would your kids say?' And they said, 'Sign 'em, sign 'em' - because they were right there, so I did." Actor Jason Isaacs recalls his strangest encounter with a Harry Potter fan.