In the many tributes to the late Gene Wilder, people mentioned his great roles in The Producers, Young Frankenstein, Willy Wonka and the Chocolate Factory and many others. I don't think anyone mentioned perhaps his greatest performance — as The Stomach in this award-winning commercial designed by artist R.O. Blechman. The other two voices were done by Luis Van Rooten, a prolific radio actor who was also heard in Mr. Disney's Cinderella as both the King and the Grand Duke. Forgive the bad edit in the middle…