Dad takes the kids to the aquarium and on the way they talk about all the things they want to see. Bart says he wants to swim in the tank. They see a Moray Eel and a Sea Bass that looks like Dad's head. Lisa then notices that Bart is swimming in the tank and Dad gets mad. Lisa is impressed when Bart does tricks while riding a shark but Dad is not. Dad screams when he sees Bart in the shark's mouth. Dad, Lisa, and Maggie then go to where they feed the sharks to wait for Bart to submerge. After a while only his lucky red swim trunks appear. Finally, Bart jumps out naked and snatches his swim trunks away from Dad and runs. Dad gets even more angry and tells Bart to come over. Bart however is being circled by a shark and says it is safer in the water than it is by Dad.