The famous “bada-bing” line featured in The Godfather was actually completely improvised on the set. James Cann, one of the actors in the movie, originally heard the phrase from his real-life acquaintance, mobster Carmine Persico. He then took that knowledge to the set, where he improvised while rolling. That take made it into the final cut of the film, and the rest is movie history. The Godfather is one of the most famous films of all time.