On the one hand, logic is the study of certain mathematical properties of artificial, formal languages. It is concerned with such languages as the first or second order predicate calculus, modal logics, the lambda calculus, categorial grammars, and so forth.
Underworld is a 2003 action horror film directed by Len Wiseman about the secret history of Vampires and Lycans (an abbreviated form of lycanthrope). It is the first (chronologically, the second) installment in the Underworld series. The main plot revolves around Selene (Kate Beckinsale), a vampire Death Dealer hunting Lycans.
The Purge is a 2013 American dystopian horror film written and directed by James DeMonaco and is the first installment in The Purge franchise. The film stars Ethan Hawke, Lena Headey, Adelaide Kane and Max Burkholder as a family held hostage during The Purge, an event during which all crime is legalized for 12 hours. Despite mixed reviews, the film was commercially successful, grossing $89.3 million, far surpassing its $3 million budget.