One of our family cats, Sammy, has an uncanny routine. Before and after being filmed, he'll meow or howl up a storm. Typically, however, he seldom meows whenever I start taking video footage of him. Lately, when looking at video footage I've recorded, I'll start feeling nostalgic for moments that weren't captured.
"Ah," I'll say. "I remember when Sammy let out several happy meows while being brushed. Of course, that was before I started recording. Then, after I stopped recording, he walked up the stairs to the landing and started howling loud enough so most of the building could hear him. Good times..."
As several people have pointed out, cats are a lot like kids when it comes to recording video.
Spring 2017: Sammy pauses to enjoy being brushed. Just before this photo was taken, he had set up a podium. After this photo was taken, he stood behind it and recited a stirring excerpt from the Declaration Of Independence. Take my word for it.