Giants’ John Mara offers hilarious warning to Brian Daboll

It wasn’t too long ago that New York Giants co-owner John Mara was throwing garbage cans in the press box in frustration over his team’s embarrassing fall from grace. These days, after a winning season under first-year head coach Brian Daboll and general manager Joe Schoen, Mara is in a much lighter mood. He is pleased with the progress of quarterback Daniel Jones and is thrilled with how Daboll has handled the New York media and fans, almost to the point where he has become a local folk hero. But Mara has a warning along with his praise of Daboll.…