A doctor who says part of a syringe got stuck in his mouth after he bit into a Big Mac is suing McDonald’s for $4.5 million. In his lawsuit, the doctor from Niagara Falls, Ontario, said the incident occurred at a McDonald’s in Niagara Falls, New York, in 1999. He says when he bit into the hamburger, the tip of a needle measuring about a quarter-inch became lodged in his mouth. He had it removed at a hospital. His attorney says the doctor has twice been tested for diseases such as HIV and has tested negative. No comment from McDonald’s on the lawsuit.