After a hard day's work on his Crystal Beach home, Everett Johnston just wanted a cold beer. He grabbed a Tecate Light out of his fridge and began to sip. But, Johnston said, something didn't taste quite right. He said his wife looked in the bottle and noticed a rat's head floating inside. Johnston filed a lawsuit recently in Galveston County against FEMSA Cerveza (CCM), the Mexican maker of Tecate, as well as Heineken, which distributes the beer in the United States, among other defendants. He's citing the severe psychological damage he says he has suffered. The 59-year-old retired firefighter...