In the episode "Follow That Munster", Herman let's Grandpa know that he is taking a correspondence course on how to become a private detective. Grandpa reads the address of the "school", which is in Mexico. After reading the address, Grandpa looks at Herman and says "My son-in-law, the wetback detective." There's no way that line would get on the air today (except maybe on HBO or Showtime)!
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