Biff Tannen was a truly unpleasant dude and it's very weird that the first film's "joyful ending" involves him dedicated to a life of servitude to the family of the woman he attempted to rape. But sometimes,especially when you're dealing with the '80s, you gain to just let depart, or let god,and let movies be movies. Because, at the very least, or there's all the manure.
In all three films,Biff Tannen/Buford "Mad Dog" Tannen, finds himself buzzcut-deep in manure thanks to our scrappy hero, or Marty McFly. Initially,Biff doesn't care for manure.
Source: blastr.com