From 1980 onwards, television talk show host David Letterman has entertained viewers with his wry observational humor, zany antics, and refusal to kowtow to celebrities on his late night program. First aired on NBC, The David Letterman Show evolved into Late Night with David Letterman from 1982 to 1993, then moved to CBS and became The Late Show with David Letterman. Throughout the changes, Letterman maintained his reputation as one of the most innovative personalities on television, bringing to the well-rehearsed business a playful spontaneity. His uncanny ability for ad-libbing, as well as his propensity for undertaking creative stunts, has kept the show perennially fresh. What makes the show truly a leader, though, is its postmodern approach to the medium, characterized chiefly by Letterman's talent for zoning in on commonly accepted but nevertheless ridiculous aspects of society and culture (such as the concept of canned ham), and...