Dirty Joke: A boy fell in the mud.
Clean Joke: He took a bath with bubbles.
Dirty Joke: Bubbles was the girl next door.
Dirty Bubbles
Explanation
Explain Bear
Listen up, buttercup. It starts off innocent, right? A boy in the mud gets clean. But hold on to your diapers, because "bubbles" ain't just soap. It's the girl next door. Get it? Because you probably don't, you probably still play with those bubbles.