Shaun of the Dead 

Shaun of the Dead is a horror comedy detailing the story of friends seeking refuge in a pub together during a zombie apocalypse. British actor Nick Frost was particularly praised for his witty one-liners and wicked sense of humor.  

During the movie, Frost’s descriptions of local pubgoers were all unscripted, including the line “And he invented the mobile disco.” It is hard to imagine if the movie would have become such a cult classic if a different actor without Frost’s quick wit had been chosen.