Sometimes Dave wakes up in the morning and feels like he is just living the same day over and over again. On the surface, not much happens in Dave's orbit. This can make Dave melancholy. Sometimes it gives him a case of "the blues." He likes excitement, he wants to see the world, and he likes to meet new people.
But when Dave really gets to thinking about it, he remembers that he has it good. He knows where his food is kept. He has a wide variety of comfortable places to nap. He has multiple windows to look out of. His home is heated in the winter and cooled in the summer. Life is good. It takes a mature cat to fully understand this.