Box of Moonlight (1997)

Emotionally stifled, socially awkward Al Fountain is an ordinary man supervising a contruction job in the midwest. When the job is cancelled, Al decides not to go home, but instead to revisit a childhood lake. After a disappointing visit to the now polluted lake, he stops to help a young drop-out named Kid, whose car has broken down. The two warm to each other and together they embark on various impulsive adventures.