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Pics or It Didn’t Happen is a popular phrase used in response to a person who has made an unbelievable or outlandish claim, common on many forums around the Internet, including Digg, Reddit, MetaFilter, Fark, 4chan, SomethingAwful, and more. Google search for the phrase returns over 8,000,000 results, although it has been used in only a few image macros, usually pertaining to the Bible.
It’s difficult to say exactly where “Pics or it didn’t happen” first originated, but one of the earliest instances is from MetaFilter.