Because he likes going wiggle wiggle wiggle wiggle wiggle.
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Wiggle wiggle wiggle yeah
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There are four Mrs. Piggle-Wiggle books written by Betty MacDonald: "Mrs. Piggle-Wiggle" (1947), "Mrs. Piggle-Wiggle's Magic" (1949), "Mrs. Piggle-Wiggle's Farm" (1954), and "Hello, Mrs. Piggle-Wiggle" (1957).