There was an 80's movie, whose title I cannot exactly remember. It took place in a typical suburban American high school and there were basically two principle characters. There was the geek and the bully. And the whole movie is based on the idea that the geek did something to offend the bully for no particular reason and now has said for him to meet out side the school at 3:30 or or 5 o'clock or something like that. In the end the geek shows up with some iron knuckles and the whole school shows up for the fight. Even the teachers are there. It was kind of like the movie the Chase in that the plot is super simple. Everything is building upon the fight that will take place at the end of the movie and the climax just builds and builds and builds.
Oh and we've already determined that it is not the "My Bodyguard"
All help appreciated. :p