“Mad About You” was one of the most popular sitcoms of the 1990s, running seven seasons. Now for the first time, the entire series is available on DVD, and star Paul Reiser joins TODAY to mark the occasion. “You can watch us age, slowly,” he jokes. He also talks about returning to the stand-up stage, claiming his kids demanded he get out of the house, and speculates about how different the show would be today: People would have cellphones.