Adolescence is a period of halcyon days. 

His utopian idea was entertaining but not acceptable. 

She didn't realize that the clever salesman was taking her for a ride. 

He has the habit of getting into a row over trivial matters. 

Once the case reached the court, the police washed their hands off it. 

A small fry 

He made my day by telling me how important I was to him. 

She wanted to go hiking but her mother put her foot down and now she's going by bus.