While on the Texas leg of the roadtrip, this time in Peter's friend Darryl's pick-up after the crash, Ethan decides to smoke his weed with the windows shut - getting them all high.
They decide to drive over the border to Mexico, but are soon stopped. Ethan escapes while Peter is detained. Then, in a daring rescue, Ethan steals the Federale truck and rescues Peter. They make a break for it, and continue their journey.
Now better friends, Ethan stops at the Grand Canyon to give a ceremony for the ashes of Ethan's father. Ethan is reluctant to let him go. Peter owns up to his actions earlier in that he tried to leave Ethan behind. Ethan forgives him - because he has held onto Peter's wallet all along. They fight, Peter is a little angry.
But, they work it out and hit the road again to get to the hospital.
They arrive just in time for the birth in the beat-up Fed truck. Peter collapses, so Ethan cuts the umbilical cord. The baby wasn't Darryl's. When he wakes up, they say their goodbyes, and Ethan heads off for Hollywood.
A little while later, at home with his family, Peter turns on the TV -- to find that Ethan is living the dream and is now a regular on his favourite show - 'Two and a Half Men'.