A man is out for a walk in the park when he sees a woman walking her pet duck on a leash. Intrigued, he strikes up a conversation with the woman and asks her all about her unusual pet.
The woman explains that she found the duck abandoned as a duckling and decided to raise it as her own. She trained it to walk on a leash and even taught it to do tricks like fetch and roll over.
Impressed, the man asks if he can try walking the duck himself. The woman agrees and hands him the leash. The man starts walking the duck around the park, feeling quite proud of himself.
But as they walk, the man notices that the duck keeps stopping and sniffing the ground. Curious, he asks the woman why the duck keeps doing that.
The woman chuckles and replies, "Oh, that's just because he's a quackhead. He's always looking for his next fix of bread crumbs!"