Shopping Trip

Listen up, buttercup. The "Twin Towers" is a reference to the World Trade Center in NYC that got turned to dust on September 11, 2001. The punchline is a pun on "plain bread" and "plane bread." It's funny 'cause it's dark and kinda makes light of a tragedy. You probably think a joke is a funny story. But jokes have specific structures that create surprise, so it's considered wordplay.