Lamb

A man walks into his local butcher's shop and complains about the leg of lamb that he had previously bought, "when I cooked it the joint had shrunk so much it went from 12 inches long to only 4-inches". The butcher said to the man "that’s funny my wife knitted me a sweater and when she washed it, it was also 4-inches in length". "what’s your sweater got to do with my leg of lamb?" asked the man The butcher replied "well they both must have come from the same sheep."