A day in the life of teenage caveman Arch-ee and his friends.; Thinking Archie is pulling a April Fool's joke, Mr. Andrews throws a box from the attic outside. Unfortunately, it contained his love letters to Mrs. Andrews and Mr. Andrews must go around town and find them.; Archie waterproofs the girls' dresses. Unfortunately, water makes the dresses shrink and when the sprinkler system goes off at the dance, chaos ensues.; Betty and Veronica are taking first-aid classes and decide to try out some methods on Archie.; The sidewalk paver tries to keep Oscar from walking through the wet cement.; Archie has trouble mailing a letter to Veronica.