Pack Up Your Troubles in Your Old Kit Bag

Pack Up Your Troubles in Your Old Kit Bag is a song sung by Percy Blakeney to a group of Trolls (who he thought were Russians) after he accidentally stepped to another earth. The Trolls seem to enjoy it.

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Pack Up Your Troubles in Your Old Kit Bag was an actual song, though was known by the slightly longer title of 'Pack Up Your Troubles in Your Old Kit Bag and, Smile, Smile, Smile.' The song was immensely popular during WW1 and was credited with boosting morale within the British troops. The full lyrics can be found here