As we've explained before, some actresses just seem to become mega stars one minute before vanishing from Hollywood without a trace.It's not a case of their careers fizzling out, so there must be something to explain their disappearing act.Shannyn Sossamon quickly became one of the biggest names to hit the scene in the early 2000s, but within a few years it seemed like everyone had forgotten her completely.Columbia PicturesAs the actress reveals, people will often stop her to ask, "You look really familiar. Are you an actor? What you have been in?" The answers are surprising, and