The sight of a severed snake's head under his broccoli made Jack Pendleton lose interest in dessert. Pendleton said he found the head, the size of the end of his thumb, while eating Sunday at the T.G.I. Friday's in Clifton Park. The chain restaurant said it regrets the appetite-killing error. Pendleton said he has no plans to sue. Pendleton said he ordered vegetables instead of fries with his chicken sandwich. When he started to eat his broccoli, he saw something gray on the plate he at first thought was a mushroom. "I start to turn it over. I see this...