Want to feel old – or at least older? It was 30 years ago that Bill Cosby revived the sitcom, and handed NBC a Number One hit show that changed TV history, with the instantly successful premiere of The Cosby Show. That pilot show is televised tomorrow at 2 p.m. ET, to kick off Day 2 of this two-day, 16-hour marathon – but today, the marathon begins with “How Ugly Is He?,” when Cosby’s Cliff Huxtable meets the smarmy boyfriend of daughter Denise (Lisa Bonet). And the day-long marathon includes the classic “Happy Anniversary” episode, in which the family, as a special gift to the grandparents, lip-synchs to Ray Charles’ “Night Time Is the Right Time.” A truly classic TV moment.