I couldn't find in on YouTube but he once did a hysterical version of his story about the man who invented cats' eyes. He went on about the guy driving over the Pennines in the fog, having difficulty seeing the road, when ahead of him he saw a cat whose eyes glowed in the light from his headlamps. The he threw away the punchline
"Of course if the cat was facing the other way he'd have invented the pencil sharpener"
"Of course if the cat was facing the other way he'd have invented the pencil sharpener"