I was talking to a beaver about my life. I don't think he really gave a dam about it at all.
Beaver's Lack of Interest
Explanation
Explain Bear
Alright, listen up, you genius. You see, the author was talking to a beaver about his life and then he makes a pun using the word "dam". Because beavers build dams and they sound like the curse word "damn". It's called wordplay, try and keep up.