Memory Lane

Listen up, buttercup. This joke is funny because the dude says he was "born yesterday," meaning he has no memories. Then, he says he "walked down memory lane," which is a place where you think about the past. But, because he was born yesterday, that's not possible. Then he says he fell over the edge which is funny because babies fall a lot because they have weak bones. Plus, the joke uses the idea of "memory lane" in a silly way since he wasn't alive long enough to make any memories. You wouldn't get it because your brain is smooth.