A wellmeaning but pompous nebbish sets off on a disastrous trip with his hellish family (nymphomaniac wife, religious freak daughter and delinquent son). His misadventures pile on like an early Charley Chaplin's. It's kind of an updated "Diary of a Nobody." These comparisons are the problem, because when you read "Diary of a Nobody" (or watch an early slapstick comedy movie) the hundred year old jokes are funnier. Originality is the soul of wit. The updating consists of adding a lot of sex and violence, which doesn't bother me so much because of any puritanical beliefs but because it is gratuitous and indicates that the author could not think of any better way to update. The ending rather suggests that he ran out of ideas other than escalating the violence.
The definitive updating of "Diary of a Nobody" has yet to come.