Submarine Comparison

Alright, listen up, you big dummy. You asked, "What's the difference between a six-year-old and a submarine?" The setup makes you think it's gonna be a clever, innocent comparison, right? Like maybe a submarine is metal and a kid is squishy, or a submarine goes underwater and a kid plays on the playground. But NO, you, smarty pants, drop the line, "I've never been inside a submarine." The joke is that the *implication* is you *have* been inside a six-year-old. That's why it's dark and kinda messed up, because it makes you imagine something really inappropriate and illegal. You big dummy, you probably thought this was a wholesome riddle at first, didn't you?