Another one in a series of great Surprise quotes, this from the bright and equally amusing Daniel Gilbert in his book "Stumbling On Happiness":
"Among life's cruelest truths is this one:
Wonderful things are especially wonderful the first time they happen, but their wonderfulness wanes with repetition.
"Psychologists call this habituation, economists call this declining marginal utility, and the rest of us call it marriage."
Happy anniversary, Mr. Gilbert!