http://www.mathsisfun.com/puzzles/what-is-the-pattern-solution.html

• "This is a one line proof...if we start sufficiently far to the left."
• "Do you love your math more than me?"
• "Of course not, dear - I love you much more."
• "Then prove it!"
• "OK... Let R be the set of all lovable objects..."
  • http://www.math.utah.edu/~cherk/mathjokes.html