So he sang Cottleston Pie:
Cottleston, Cottleston, Cottleston Pie,
A fly can’t bird, but a bird can fly.
Ask me a riddle and I reply:
“Cottleston, Cottleston, Cottleston Pie.”

~ A. A. Milne (The House at Pooh Corner)

“Cottleston Pie” is a term coined by A.A. Milne in his Winnie the Pooh stories. It is a nonsensical phrase used in the poem “Cottleston Pie” featured in the book “The House at Pooh Corner.” In the context of the poem, it represents a philosophical idea about the nature of things and is often interpreted as a reflection of the simple wisdom found in the Hundred Acre Wood. The phrase has since become emblematic of the whimsical and philosophical themes present in Milne’s works.