Arnold has a birthday party which is "stag or drag"....meaning dates. Opie tries for a week to ask Mary Alice Carter, but she avoids him to "water her mother's roses" in hopes that Fred Simpson will ask her. Opie finally asks and Mary Alice agrees to be his date.....after which Fred asks her. She breaks the date with Opie to go with Fred. Opie is initially crushed and doesn't plan on going to the party....but Andy encourages him to go ahead and act like it didn't even bother him. He goes and winds up with Mary Alice at the end of the evening.