One lovely spring morning I called my wife to say breakfast was ready. She appeared, still half asleep and bleary eyed, and sat at the table.
When I grinned at her troubled expression she wailed 'Oh God, I'm forty years old today.'
She looked up at me and said, pleadingly, 'Do I look forty?'
'Naw,' I assured her, still smiling, and allowed a few seconds to pass before adding, 'You USED to.'
She was forty years and one week old before she spoke to me again.
Twenty-five years later she STILL doesn't think that was funny.