Father William finished the goosedetails

‘You are old,’ said the youth, ‘and your jaws are too weak
    For anything tougher than suet;
Yet you finished the goose, with the bones and the beak—
    Pray how did you manage to do it?’

‘In my youth,’ said his father, ‘I took to the law,
    And argued each case with my wife;
And the muscular strength, which it gave to my jaw,
    Has lasted the rest of my life.’