You shouldn't sneak into places you aren't allowed.
John hears about a new hit movie that was just released, but he's too young to buy rated R tickets.
John wants to see the movie.
John decides to watch the movie later when it's released on DVD, and sees a different film instead.
John buys tickets to a different movie and then sneaks into the rated R one.
John enjoys the movie on DVD from the comfort of home.
John is caught by a theater employee towards the end of the movie and is kicked out.