NEW YORK—Following another impressive start Monday, enigmatic but lovable Mets clubhouse joker Pedro Martinez informed reporters that he was "just kidding" about his arm injury, rotator-cuff surgery, and yearlong stint on the DL, playfully shrugging his shoulders and grinning in a fashion Mets officials are calling "vintage Pedro." "Boy, are our faces red," said Mets GM Omar Minaya, chuckling and shaking his head at the stunt, perhaps Martinez's craziest to date and one which has cost the team an estimated $16 million. "I can't believe we fell for the old 'torn rotator cuff' gag. Oh, Pedro. What will he think of next?" Mets manager Willie Randolph is planning to play a retaliatory prank on Martinez, which involves leaving him in past the sixth inning of a crucial playoff game.