FCC Chairman Ajit Pai took a swipe at two canceled TV shows during a keynote address Tuesday — and invoked the retirement of Los Angeles Dodgers broadcaster Vin Scully to explain his hands-off approach to regulation. After taking the stage at the National Association of Broadcasters show in Las Vegas, Pai joked that he had never given a keynote address there before — and took his out-of-nowhere jab at the canceled shows.