Season 12 - Episode 4

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Arlen is hit by a heat wave and Hank and the gang take the kids to the water park. Unfortunately, when they have to tangle with a group of surfer bullies, Boomhauer, who is usually cool, winds up embarrassing himself. Meanwhile, Bill becomes known as the famous "Heat-Waver" when he begins to stand on the side of the highway and wave to motorists.