What was the most creative logo you've ever seen?

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The advertising companies bet practically everything following the logos for other companies. In the eyes of some people, this is a very easy activity (like any other activity involving the act of drawing). But for other people, it's something of extreme value because they know that it's not about a simple drawing (because it's a job that, besides skill... it needs a lot of creativity). Can you remember what was the best logo for you?