In my opinion, by far, the funniest episode of King of the Hill is, Luanne Virgin 2.0. There is a scene where Hank, Peggy, Luanne, and Rev. Thompson are at the lake to give Luanne her baptism...
Uh Oh, Canada - it's about when Boomhauer swaps houses for the summer with a family from Canada. Hilarity ensues when the family proceeds to get on the abd side of the Hills.