Pop Warner
... that American football coach Pop Warner's only experience with the game in his youth was using an inflated cow's bladder?
... that American football coach <b id="mwAtM"><a href="./Pop_Warner" id="mwAtQ" rel="mw:WikiLink" title="Pop Warner">Pop Warner</a></b><span about="#mwt40" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"`s","href":"./Template:`s"},"params":{},"i":0}}]}' id="mwAtU" typeof="mw:Transclusion"><span typeof="mw:Entity">'</span>s</span> only experience with the game in his youth was using an inflated cow's <a href="./Bladder" id="mwAtY" rel="mw:WikiLink" title="Bladder">bladder</a>?