“Jeez Louise. I know why rich people are so thin: it's from trekking around their humongous houses the whole time.”

“I mean, jeez, look at this! It's still there after a whole week.I'm scarred for life by a valentine hurled at my head.”

“My house fly theory is related to my theory about why time seems to go faster as you get older.""Why's that?" the girl asked."It's proportional," Leonard explained. "When you're five, you've only been alive a couple thousand days. But by the time you're fifty, you've lived around twenty thousand days. So a day when you're five seems longer because it's a greater percentage of the whole.”

“I know why old people are so wrinkley, it's because they wash so often.”

“She's so thin she's either dying or rich.”

“That's the difference between us {the poor} and them {the rich}, I thought. We know all of what's bad because we can't keep from it. They live in their big houses and the walls are thick enough around them to keep the bad out.”