David Letterman looked like "either Dinty Moore or Paul Bunyan's son." Or so recalls Jay Leno from his 1996 book on his first meeting with Letterman in 1975. It was a fateful encounter that formed an initial partnership and friendship. But now, in retrospect, it's a tragic relationship in which the repercussions from the fallout between the two are still being felt 35 years later, changing late night television forever. And, unknowingly, altering the fate of a then-12 year-old boy living in Brookline, Massachusetts -- Conan O'Brien. Letterman, on a January 19 episode of Late Show, referred to Jay Leno in a discussion about the current late night television battle as "vintage Jay." What does "vintage Jay" mean, and why does Letterman feel this way? Allow us to break down exactly why Jay and Dave have come to despise one another, both in real life and for our television enjoyment.