Proof (With picture) : [url]http://www.chronicle.su/news/curiosity-rover-finds-fossil-evidence-of-life-on-mars/[/url]
Not little green men, but a fossilized coral reef, which may or may not even be fossilized yet.
Was discovered when Curiosity found evidence of a once waist-deep streamline.
[Edited on 10.09.2012 10:18 AM PDT]
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Well, Mars apparently did have some oceans before, so it makes sense. I hope that there is still life on Mars. edit: Aww, that's just disappointing. =( [Edited on 10.09.2012 4:32 PM PDT]