I can't remember who was meant to have said it to whom - some society beauty to a leading politician - but the conversation was along the lines of:

'We should consider marriage. Consider - a child with my looks and your brains.'

'No thanks! Consider a child with my looks and your brains.'

I was fool enough to apply this once to someone who was boasting about his mother who had a doctorate and father who had played rubgy at an international level...