When I was a younger game programmer, I considered for a while getting a tattoo of:

  function intersectRect(r1, r2) {
    return !(r2.left > r1.right || 
           r2.right < r1.left || 
           r2.top > r1.bottom ||
           r2.bottom < r1.top);
  }

After many other tattoos, some spur-of-the-moment and some thoroughly considered for years, I realized that I like my spur-of-the-moment ones a lot more. They never had any significance to lose, whereas the well-thought-out ones are more embarrassingly telling of what I once thought was so deep and passionate, which all turned out to look naive after a few years.