It's rude to sneak somewhere.
John is walking by a movie theater and sees a new film he is interested in that costs $10 a ticket.
John wants to get in and watch the new movie.
John pays $10 for a ticket and finds a good seat for the movie.
John attempts to sneak in the back exit door to see the movie without paying for a ticket.
John has a great time and really enjoys the movie.
John is caught by security staff and thrown out of the theater, so he doesn't get to see the movie.