First, you need to find a movie worth going to.  The really good movie can be a rare find.  I prefer to see action movies, chick-flicks can wait for the DVD to come out.  Then, show up early enough to buy some over-priced popcorn, Raisinets, and Coca Cola.  Having the right combination of junk foods is essential to the entire experience.  Milk Duds may be a subsitute for the Raisinets, though they may pull your fillings out.  Then you need to find the right seat.  I prefer the middle of the theatre, probable an isle seat.  Isle seats are handy if it's a long movie, or if you get the extra large soda pop.  Turn off your cell phone, kick back, and hope no one with fluffy hair sits in front of you.  Enjoy the half hour of previews (whispering is allowed during the previews, but not during the movie).  That's it.