Irving Zisman, a retired old man, is at the funeral of his wife when his daughter Kimmie confronts him with a dilemma. She is going back to jail for violating parole, and she needs Irving to take his grandson Billy to stay with his father until she can get back out. Billy's father is reluctant to take his son back until he realizes he can get child support, so he tells Irving to get Billy to him by the end of the week. Irving decides to hit the road with his wife's body in the trunk, as he feels she should be buried in her home, the South. Along the way, Irving gets himself into serious trouble, from the post office where he attempts to mail Billy to his father in a large box, to the retirement home where he crudely hits on the old ladies playing Bingo. He also gets physically removed from a male strip club when he exposes himself and begins rubbing his privates on others in the vicinity. They try to find free food along their trip, and Irving encourages Billy to steal from stores; at one point, Irving crashes a wedding to get Billy some cake, ruining the wedding in the process. Irving finally arrives in North Carolina, but when he drops Billy off with his father, he is forced to decide whether he should keep his freedom or protect Billy from a life with a negligent dad.