L might have argued that he was different, that he always remembered faces and the first place he met someone, if he encountered them more than once. His brain was like an extensive, living filing cabinet, and that sort of retrieval was truly child's play. But he remained silent, listening to Laura talk about Shadow Moon and what he had been to her. He found it interesting the way she described him as a 'big, dopey puppy'... hardly words that implied great respect. Had they been married simply because it had "clicked," because it was convenient?
Money was something L had almost always had a lot of. He was so talented that it had simply fallen into his lap, in many cases. Maybe that was why it had never been a good or a bad thing to him, but simply something that meant he could have comfort and sweet things. Considering it now, though... it was cause for many crimes. It tore people apart and turned them into greedy, empty things. Furthermore, it equaled time, and he had heard that women were a product of money and time, and therefore the square root of women was money, and therefore... he cringed inwardly. Using that reasoning (which he had heard as a joke, not come up with on his own), women truly were the root of all evil.
He probably shouldn't share that with Laura at this time. It could be "inappropriate."
What followed reminded L strongly of another conversation he and Laura had had about the subject of death. He wondered why, every time it came up, her attitude towards life and living seemed to improve. If he didn't know better, he'd say that she was trying to influence him. But L had thought about it lately, and it seemed like, when you died, it became clear based on what sort of life you'd lived what kind of person you were. L had never allowed another person to become intimately familiar with him, and it seemed like dying, having your skin stripped away, your heart weighed and truths and secrets laid bare would do the trick. And all he, L, the great detective, would have to do was lie still.
But Laura wanted to be alive. She had had both life and death and would know, wouldn't she?
"Of course you're yourself..." he said, keeping his eyes open and his mind working, taking another drink of coke. "I've never thought that people can truly become other people entirely, except in cases where mind-altering drugs, illness, or psychoses are involved. Your ordinary, healthy person changes in minute ways every day, and over time the changes seem large, but they are the result of influences and events. Every time something sentient learns something new, they change a little bit... I'm different now than I was ten minutes ago, because I feel like I know more about you."