John Travolta&amp;#39;s charming demeanor earned him quite a few commercial roles in the 1970s, such as this ad for &amp;lt;a href=&amp;quot;http://www.youtube.com/watch?v=HoyBCz30cQM&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;Safeguard soap&amp;lt;/a&amp;gt; -- that&amp;#39;s him on the left, of course -- before his big break on &amp;quot;Welcome Back Kotter.&amp;quot;