Oh, this is a big one. If you think it’s cool to download illegal movie files, I’ve got information to help you think again. It’s not cool. It’s against the law and the movie houses are going after violators.
When you download a movie file using a file sharing program one of the requirements of the peer to peer software you used is that you make that file (and all others) available to other users of the system. This means that in the middle of the night someone half way across the world can find a copy of the latest Harry Potter movie on your hard drive and download it direct from you. At this point you become a pusher of the movie, and the copyright infringement groups track you down through your IP address. They find out who owns the IP address (your internet provider) and they require your ISP to turn off your internet connection.
Now, in some cases it’s one strike and you’re off for good. In other cases you are given the opportunity to sign a form saying you’ll never do it again, you’ll remove the files and understand that a future offense is very very bad.