Bobby Valentine was just trying to keep things loose — and perhaps save his job — when he donned a makeshift disguise and returned to the New York Mets' dugout after being ejected from a game against the Toronto Blue Jays on June 9, 1999. On the eve of his induction into the Mets Hall of Fame, Valentine reveled in that clandestine act Friday night when the former manager again wore sunglasses and a fake mustache while throwing out the ceremonial first pitch to a similarly disguised Mr. Met. The 76-year-old Valentine, who will be honored Saturday alongside ex-Mets teammate Lee Mazzilli, emerged from the New York dugout and received a warm hand from a Citi Field crowd that included fans already adorned in the ballpark giveaway — sunglasses and a fake mustache.