The four seasons were arguing about which of them was the best.
Winter boasts, “Well, you can build snowmen, and the snow is so beautiful. And Christmas!! Everyone loves Christmas!”
Spring laughs, “Well, sure, but come springtime, everything is so fresh and new! All the new flowers, it can’t get much better than that!”
Summer rays, “Yes, but I am undoubtedly the overall best season! Kids are on vacation, ice cream, and nice weather. You can’t top that. What about you, autumn, what do you have to offer?”
Autumn ~ -leaves-
Explanation: Each season argues for its greatness, highlighting what makes it special. When Summer mocks Autumn for being seemingly unimpressive, Autumn responds simply with “-leaves-“, playing on the pun: Autumn is known for falling leaves, and the word also means “exits”—so Autumn drops the mic and walks out.