When a straight-laced couple that has fun with a rowdy couple on vacation in Mexico return to the States, they discover that the crazy couple they met in Mexico followed them back home and decide to play tricks on them.

Teddy Walker is a successful salesman whose life takes an unexpected turn when he accidentally blows up his place of employment. Forced to attend night school to get his GED, Teddy soon finds himself dealing with a group of misfit students, his former high school nemesis and a feisty teacher who doesn't think he's too bright.