Hiss and Boo Only if You Aren't Invited.(Sony plans a live performance by Jerry...

"How could anyone not like him?" Jerry Seinfeld's mom asks in the "Seinfeld" episode "The Pilot." After the series' nine years in national syndication, the answer is lots of people love him and continue to watch. The hit sitcom averaged a 5.0 Gross Average Audience rating among men 18 to 34 for the first seven weeks of the 2003-04 season. Now it is about to enter its third cycle as an off-network strip. To celebrate that success, including a recent 2 percent jump in year-to-year ratings, Sony is quietly planning a very special, very intimate live stand-up comedy performance by Mr.