The Rapture

I heard the most incredible thing on the news tonight. A commentator was discussing the relevance of current world events with prophecies from the book of Revelation. The news person outlined the main beliefs and went into a brief monlogue describing each of the terms mentioned (Armageddon, Revelation, etc.). When it came time to describe what the Rapture was, the commentator opened with these words: "Even though it's not found in Scripture..." and continued to explain who believed in the Rapture and why.

This leads to one of the most glaring questions in recent memory: If it isn't in Scripture, how on earth can it even be entertained as doctrine?