A worried father calls the family doctor because he thinks his teen son has caught a venereal disease.
“I think he got it from the maid,” says the concerned dad, “and I’ve also been sleeping with the maid.”
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“Okay,” the doctor replies calmly. “Well, when you bring him into the office we’ll take a look at you as well.”
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“And that’s not all,” the father continues. “I think I might have given it to his mother.”
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“Oh no!” cries the doctor. “Well, now we might all have it!”