A Bloody Mary is a popular cocktail containing vodka, tomato juice, and usually other spices or flavorings such as Worcestershire sauce, Tabasco sauce, celery, olives, salt, black pepper, cayenne pepper, lemon juice, and celery salt. The Bloody Mary's origin is unclear, and there are three conflicting claims of who invented the Bloody Mary. It has been called the world's most complex cocktail. While there is not much complexity in mixing vodka and tomato juice, more elaborate versions of the drink have become trademarks of the bartenders who make them. A common garnish is a celery stalk when served in a tall glass, often over ice.