Instead, take the extra 10 minutes to find Oldboy on a legitimate streaming service. Pay the $3.99 rental fee, or borrow the disc from a friend. Watch the hallway scene in crisp HD. Let the jaw-dropping twist hit you without a pop-up ad obscuring the screen. That is how Oldboy deserves to be seen—not as a compressed, illegal MP4, but as the brutal, beautiful work of art it is.

The film won the Grand Prix at the 2004 Cannes Film Festival and is frequently listed among the greatest films of the 21st century. Its iconic "corridor fight scene"—a single-take, horizontal scrolling brawl—has been analyzed, parodied, and imitated countless times in movies and video games.

Remember: Revenge is good for the soul, but piracy is bad for your computer.