According to Jim

Season 7, Episode 3: Safety Last

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When Cheryl takes a greater interest in general safety and health, Jim feels stifled by her new rules and regulations. Just after Cheryl forces Jim to wear an I.D. badge during his morning jog, Jim is head-butted by a bull on a side road. While Cheryl learns that one can't anticipate every danger out there, Jim realizes that he's willing to do whatever it takes to make his family feel secure.