A TV ad for cat food recently had a picture of a cute kitten play with a ball while a clowder of cats are talking about how cute he is. They keep making such comments until you hear a door open and human voices in the background. Then you hear:
"They're back! Quick, act like a cat!"
Good Grief!! I've waited two decades to find a situation where I could use the phrase "a clowder of cats" and not one person noticed!?