John Stossel may have gotten an eyeful as he dined at the Central Park Boathouse recently. The "20/20" investigator was at a table close to Barbara Corcoran when friends told the real-estate royal she'd lost weight. "Show us your butt," cried one, and Corcoran obliged, dropping trou ...Coming hot on the heels of Page Six's recent tale of Barbara's accidental trip to Syracuse due to an improbable flight mixup, this Rush & Molloy nugget seems to indicate a continued decline in the Corco-devil's sanity, standards, and/or pants. Very Lohan. Is banquette-dancing next?