Attack of the 3-D Zombies

What happens when you're underage and you successfully sneak into the scariest zombie movie ever made? If you're lucky, then you can just leave after the movie is finished and brag about it to your classmates on Monday morning. If you're Will and John, however, then you'll quickly find yourselves in over your head when the zombies from the movie decide to follow you out of the theater. How will the boys survive this bizarre turn of events? Will they live long enough to brag about it in school?