Gene Wilder often said that his job as an actor wasn't to make something funny but to make it real.
Gene WilderI put out my hand to shake hands with Zero Mostel, and he took my hand [and] he pulled me up to his face, and he gave me a kiss on the lips. And all my nervousness went out the window.
Gene WilderIf the physical thing you're doing is funny, you don't have to act funny while doing it...Just be real and it will be funnier
Gene Wilder