On a fiercely windy autumn day, Pooh and Piglet decide to visit their friends simply to wish them a "Happy Thursday," braving the blustery weather across the Hundred Acre Wood. Their final visit to Owl's house turns perilous when a strong gust blows the tree down, trapping Pooh, Piglet, and Owl inside the overturned home. With the usual exit blocked, Pooh devises a plan to hoist the small and initially hesitant Piglet up to the letterbox using string. Encouraged by Pooh calling the potential rescue a "Very Grand Thing," Piglet overcomes his fear, bravely squeezes through the letterbox, and runs off to fetch Christopher Robin, demonstrating significant courage and embodying the story's theme of friendship and bravery in unexpected circumstances.