They run into an abandoned warehouse and see three barrels so they jump in them to hide.
The Nazis search the warehouse and see the barrels. One of them kicks the first one and the English man shouts out "Woof woof!" So it must just be a dog.
They then kick the second one and the Scotsman shouts out "Meaw meaw!" So it must just be a cat.
Then they kick the last one and the Irish man shouts out "Potatoes potatoes!"
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