Sometimes topics start out about one thing and they just organically morph into something else. In most cases (unless there's already a topic on the forum to discuss the subject that they're morphing into) we just let them. And if the new subject's discussion really takes on a life of its own, like the discussion here about Louis, we simply split the topic into two (or sometimes even more) topics, like has also happened here.
And just to go OT for a second: Boy - I guess I was lucky to be in this topic when I was because, Taeylor, that Barbara Steele as Julia avatar was really short-lived. If I'd blinked at the right time, I almost would have missed it!
EDIT: OMG - now it's switched from Spectral Angelique to Vicki on the train!!