30. Mysteries of the Ancient Unknown
An occasional segment where Colbert investigates unexplained phenomenon of the distant past, "Mysteries of the Ancient Unknown" peaked with his pseudo-hard-hitting 2010 report that looked into the strange disappearance of King Tut's penis. Despite some spectacularly stereotypical Egyptian music that was used to score the segment, the host never really came close to cracking the case of the pharaoh's pilfered phallus. But it did inspire this great throwaway line: "Speaking of ancient shriveled kings, Larry King is retiring!"