When Kaeloo talks about becoming grown-ups, Mr. Cat briefly has an Imagine Spot where Quack Quack becomes an adult, and the end result is that Quack Quack becomes a giant and crushes him. It's Played for Laughs, but think about Mr. Cat's past experiences with adults for a moment. This might be how he sees all adults - as giants before whom he is powerless and have no issue with squashing him.
