Liquid nitrogen evaporates, and can cause violent oxidation of organic material. Ingestion of liquid nitrogen can cause severe internal damage, due to freezing of the tissues which come in contact with it and to the volume of gaseous nitrogen evolved as the liquid is warmed by body heat. In 1997, a physics student demonstrating the Leidenfrost effect by holding liquid nitrogen in his mouth accidentally swallowed the substance, resulting in near-fatal injuries. This was apparently the first case in medical literature of liquid nitrogen ingestion. In 2012, a young woman in England had her stomach removed after ingesting a cocktail made with
Ice cream float soda combination of vanilla ice cream and guaraná soda. In Mexico the most popular version is made with coke and lemon sherbet. An orange float or orange whip consists of vanilla ice cream and orange soft drinks. Guinness Stout, Chocolate ice cream, and espresso. Although the Shakin' Jesse version is blended into more of a milkshake consistency, most restaurant bars can make the beer float version. When making at home, the beer and espresso should be very cold so as to not melt the ice cream. A flavor popular in New Orleans and parts of Ohio, made with a syrup