"Dog Poop" joke
Young Justin has a cursing problem, and his father's getting tired of it.
He decides to ask a shrink what to do. The shrink says, "Negative reinforcement. Since Christmas is coming up, ask Justin what he wants from Santa. If he curses while he tells you his wish list, leave a pile of dog poop in place of each gift he requests."
Two days before Christmas, Justin's father asks him what he wants for Christmas. "I want a damn teddy bear lying beside me when I wake up. When I go downstairs, I want to see a damn train going around the damn tree. And when I go outside, I want to see a damn bike leaning up against the damn garage."
On Christmas morning, Justin wakes up and rolls into a pile of dog poop. Confused, he walks downstairs and sees another pile under the tree. He walks outside, looks at a huge pile of dog poo by the garage, and walks inside. His dad smiles and asks, "What did Santa bring you this year?"
Justin replies, "I think I got a goddamn dog, but I can't find the son of a bitch!"
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