This. There's a TON of diversity in Japan from local customs to dialects like People from Osaka are known to unashamedly bargain for a lower price. People from Kyoto are aloof and unfriendly to strangers (aloof yes, unfriendly no). Wakayama people are country bumpkins. Regional differences provide a rich source of humor of a kind that is now effectively outlawed in America, where diversity is celebrated but differences must go unmentioned for fear of hurting someone's feelings.