(Original Joke) A boy goes to the zoo with his father...

A boy goes to the zoo with his father. They're at the Primates section. The father asks the boy, "Do you know what that animal is?" And the boy says "Yeah... a monkey." And the father says, "No son... that's an orangutan! Orangutans are apes!" And the boy learned.

Across the park... the father asks the boy, "What animal is that?" and the boy responds "That's a crocodile!" and the father says, "Nope! That's a alligator, son. You can tell by the V-shaped snout." And the boy learned.

They keep walking to the Predator exhibit where the father again tests the boy... "Son, what animal is that?" And the son says "That's a anaconda!" And the father says, "No son, that's just a regular old snake."

And the boy says "Oh cool! Is that were Mommy's penis went?"

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Edit: I forgot to mention that the father previously had explained to his son Jeffrey that "all women originally had penises but eventually they would wither off and die like dead skin" - a harmless myth created to deter his child from growing up believing men and women were different; the question was answered with good intention.

So... when Jeffrey referred to the snake as "Mommy's penis", he was simply rationalizing his experience by utilizing his prior understanding of what pensis' are... believing that "once detached from a woman's body, the penis could still survive in the wild." Amazingly 8-year-old Jeffrey was actually beginning the early stages of inductive logic, which is the "theorized" third stage in child development!