Sam doesn't realize it, but Josie is really 25 and a reporter who has gone undercover at her old school to whip up a report on today's youth. If she's nervous at the prospect, it's because eight years earlier on the same campus she virtually defined the term hapless dork. Josie was the overly sweet and vulnerable one who did everybody's homework and got splattered with egg for her trouble. At school she passes for 17, even after bandying about higher literary concepts in Sam's class. Everything else goes badly.
School now entails a weapons check each morning, and the students are just as crude and nasty.
Somehow Josie remains as gushily obsequious as she was at 17. But after eating too much ganja cake and otherwise making a fool of herself, she inadvertently reinvents her image by coming up with a theme for the prom, which at this school is a little like Moses returning from the mountain top. Suddenly cool, she gets to hang out with the in-group. Later she shows her true colors and issues a ringing defense of the dorks. And now for that kiss.