Happy Days S09 E19 Hello, Flip

"Those were the days of the 1950's...filled with innocence and the promise of even better days to come."

Roger's family sends his brother, Flip, to Milwaukee with the hope that Roger can straighten him out. Roger entrusts Flip to pick up Marion after he attends a Fats Domino concert, but he skips the concert to hang out with some hoodlums and leaves Marion to walk home in the cold.