Films generally start with a logo. Many studios, the best example of which is probably MGM, never alter their logo. It stands as an enduring brand. Some studios will alter their logo to fit the tone of the film though and the best example of this is probably Warner Brothers.
Designer Christian Annyas has assembled [a collection of images of the Warner Brothers logo](http://annyas.com/screenshots/warner-bros-logo/). That’s 13 primary logos with over 200 variations over the last 90 years.
Above is one of my favourites, the version used in _The Maltese Falcon_ in 1941. Below the jump are a few more of my that I like. Yes I’m aware this is totally dorky.