Broken Flowers (2005) ending / spoiler

Don (Bill Murray) returns home from his search and finds another pink letter and this letter is from Sherry (Julie Delpy) saying that she wants to get back together with him. Don talks with his neighbor Winston (Jeffrey Wright) and mentions that none of the women he visited is his son's mother. At a diner, Don sees a kid who was at the airport the night before and he thinks that's his son. He buys him some food and after talking for a bit, he says "I know that you think I'm your father" and the kid, freaked out at this, runs away. Don runs after him but doesn't catch up. He stands alone in the street and some guys drive past him and one of the guys in the car looks at Don, meaning that he may or may not be Don's son and that the son could be anywhere...

Submitted by Alex