Many loosely connected characters cross paths in this film, based on the stories of Raymond Carver. Waitress Doreen Piggot accidentally runs into a boy with her car. Soon after walking away, the child lapses into a coma. While at the hospital, the boy's grandfather tells his son, Howard, about his past affairs. Meanwhile, a baker starts harassing the family when they fail to pick up the boy's birthday cake.
A wild, freeform, Rabelaisian trip through the darkest recesses of Edinburgh low-life, focusing on Mark Renton and his attempt to give up his heroin habit, and how the latter affects his relationship with family and friends: Sean Connery wannabe Sick Boy, dimbulb Spud, psycho Begbie, 14-year-old girlfriend Diane, and clean-cut athlete Tommy, who's never touched drugs but can't help being curious about them...