Episode: "Canned" (Season 1, Episode 8)

If any show deserves a back-to-backs spot on this list, it's Rocko's Modern Life. You've probably seen this moment a million times: Upon getting fired from his job at the comic book store, Rocko takes up an assortment of jobs, including being a phone sex operator. To an adult, all of the hints are there: the advice paper that says, "Be hot, be naughty, be courteous," and what Rocko is saying to his customer (turns out to be Mrs. Bighead), makes it very obvious that phone sex is happening. Too bad Mrs. Bighead didn't get her fix, though.