Due Date

Due Date is a 2010 American comedy road film directed by Todd Phillips, cowritten by Alan R. Cohen, Alan Freedland, and Adam Sztykiel, and starring Robert Downey, Jr. and Zach Galifianakis. The film was released on November 5, 2010. The film was shot in Las Cruces, New Mexico, Atlanta, Georgia, and Tuscaloosa, Alabama.

Ethan stops to buy marijuana, and Peter discovers that he is nearly out of money. Since Peter has no I.D., he gets his wife to wire the money to Ethan, but discovers Ethan had the money wired to his stage name instead of his legal name. When the Western Union employee Danny McBride refuses to accept Ethans Stage name I.D. it leads to a violent altercation.After a night at a rest stop, Peter decides to drive off and leave Ethan there, but realizes that he still has Ethans fathers ashes, having forgotten to unload them with the rest of Ethans stuff when he left. This causes him to wrestle with his conscience, and he decides to return. Peter gets Ethan to drive so Peter can get some rest, but Ethan falls asleep at the wheel and crashes the car. After Peter and Ethan are picked up by Peters friend Darryl Jamie Foxx, Peter again decides to part company with Ethan. Darryl initially persuades him otherwise, but then throws Ethan out after mistakenly drinking Ethans fathers ashes. ........

Source: Wikipedia