Which episode of King of the Hill is this?

OK so Hanks dad come to town or whatever and bring bobby to his military school and bobby does something wrong or something so hanks dad go's to this like cement box on the outskirts of the military shcool and there are christmas decorations in it, then he puts bobby in the box and he stays there for like 4 days or something, does anyone know which episode this is or even for that matter what season it is.