Mr. Woodcock(2007)

John Farley, author of a best-selling self-help book about letting go of the past, violates his own advice when he returns to his small hometown to receive the community's highest honor. While there, John learns, to his horror, that his widowed mother, Beverly, is engaged to be married to none other than Mr. Woodcock, the gym teacher whose sadistic exploits were the bane of John's youth. Abetted by his nerdy old pal, Nedderman, John plots to break-up the relationship. But their well-laid plans go awry.