Robbie has a wonderful time going steady with two girls simultaneously -- a highschooler and a college co-ed -- until the two ladies compare notes one day and plot immediate revenge. They maneuver Robbie into dating the both of them on the same night.

Chip is worried when his younger brother Ernie becomes a close friend of a pretty sixth grader, because the girl is now interested in collecting postage stamps, and Chip is sure she has her eye on Ernie's precious Liberian triangle.