In this episode of Happy Days Ralph is challenged to drag race another teen, Fonzie steps in to ride for Ralph.
Potsie, who is staying over at Richie's house while his parents are out of town, convinces Richie to sneak out with him and watch the drag race. Jonie over hears the boys' plans and when the boys turn up missing, Jonie tells Mr. and Mrs. C where the boys' went. Mr. C goes to get the boys, right when he gets there Richie is about to drop the flag to start the race. Mr. C runs out to stop Richie, and grabs the flag. The police show up and take all the teens into custody, they even bring in Mr.C.
Mr.C. grounds Richie for life, and then later reduces the sentence to two weeks. Great episode.