I remember him on the Steve Allen Show. Steve would mock up these "man on the street interviews". They'd open the frame with a shivering twitching Don Knotts, and Allen would ask him "Are you nervous?" and he'd shoot back this startled, bug-eyed. "NOPE!" Still cracks me up.
His humor is timeless. My kids were as amused by my favorites as I was. The Incredible Mr. Limpett, The Reluctant Astronaut, The Shakiest Gun in the West, The Ghost and Mr. Chicken, and the Apple Dumpling Gang.