A friend's wife (who is a mundane) asked him that question one day as he was watching a TOS episode. She couldn't grok why anyone would want to watch the same episodes over and over.
"You know all the lines, you know how it ends. What fun is it?"
So a few days later he and his wife were puttering around the house, and she was listening to a favorite album ("CD" to you youngsters).
He asked her, "How can you listen to that same album over and over?"
Not remembering their previous conversation, she started to explain how she likes the music, and how she enjoys listening to songs she knows and loves and how they're something familiar that makes her feel good.
He raised an eyebrow and looked at her meaningfully. "Like watching a favorite TV show?"
She said "You set me up for that, you son of a bitch!"

"You know all the lines, you know how it ends. What fun is it?"
So a few days later he and his wife were puttering around the house, and she was listening to a favorite album ("CD" to you youngsters).
He asked her, "How can you listen to that same album over and over?"
Not remembering their previous conversation, she started to explain how she likes the music, and how she enjoys listening to songs she knows and loves and how they're something familiar that makes her feel good.
He raised an eyebrow and looked at her meaningfully. "Like watching a favorite TV show?"
She said "You set me up for that, you son of a bitch!"
