A heat wave hits town and Chet has diverted all the water to his private pool. Les and crew build a awsome water park in the back yard. Les is concerned about the swimsuit that Lars is almost wearing. His worries are short-lived as his own baggie trunks are sucked off and clog up the water park's pumping system. Les must come to the rescue but first he must cover up the bare facts of his lack of trunks.