Hank and Kahn fear the worst when Bobby, Connie, and Joseph explore a cave where teenagers go to "make whoopee."
Bobby and Connie raise the ire of music teacher Eugene Grandy when they interrupt his class by adding their own lyrics to popular tunes. As punishment, Grandy calls Hank and Kahn to the school and voices his concerns regarding their disruptive behavior. It soon becomes apparent to Grady that the men have set a bad parental image. But his efforts to change their behavior fails miserably. The next day, Hank and Kahn punish their children by making them perform chores. Bobby tires of cleaning out a rain gutter and makes his way to Connie's house. The children hop on their bikes and head off in search of adventure. During the ride, they encounter Joseph, who suggests a journey to "The Caves," a place where teenagers go to "make out." As the threesome make their way into the dark cave, they are spotted by Eustis's son, Randy, who warns them not to venture inside.
Bobby, Connie and Joseph ignore Randy and make their way into the darkened cave. Meanwhile, Hank, Kahn, Peggy and Minh embark on a desperate search for the missing children. Eventually they encounter Randy, who reveals that the children wandered into the caves. Hank panics. He tells Kahn that the caves are where teenagers go to "make whoopee." Later, Joseph, Bobby and Connie become trapped when their light sources extinguish, plummeting the cave into darkness.
The children begin to panic when they run out of food. When Bobby offers his body as a source of sustenance, he greatly impresses Connie. Hank and Kahn make their way into the cave...but Hank loses his bearings and the pair become lost. They fall through a narrow crevice and land in a pile of old beer cans. During the ensuing conversation, Kahn admits that Bobby is a "good boy" and doesn't fear becoming an in-law with his neighbor. The men swap stories, and their laughter echoes through the cave, attracting the attention of the children. The kids follow the sound...and inadvertently tumble through the crevice. Shortly thereafter, a beer can tumbles from above, striking Hank in the head. The group establishes communication with Bill on the surface, and the fire department pulls everyone to safety.