It's Tough for Everybody (1975)

A boss meets a young Turk,Dan, in the toilets of a restaurant. He hires him in his business ,he runs an advertising agency .Dan,the young man ,has strange ideas which disconcert his boss.He calls the owner's decisions into question ,and soon , he is fired .Undaunted, he decides to create his own agency with a revolutionary concept:to tell the truth ,the whole truth about the products .Now, Dan is in competition with his former boss.