I want to see the movie, so I'm planning to sneak into the theater.
I don't think this is a good idea. Why would you sneak into the movie theater?
I don't feel like paying to see the movie.
It is wrong to sneak into the movies without paying. If you get caught you might get the cops called on you.
No worries, I will do it when they're busy and preoccupied. I will not get caught.
You will still be at risk of getting caught and you will not have a ticket with you and will probably get banned on that theater. You should just save up for things you want to do or buy, rather than sneaking in or stealing things. That's the more responsible way to live nowadays.