There's an apocryphal story about how golf came to be played over 18 holes. Apparently it was an 18th century suggestion from one of the St. Andrews old-timers, who noted that it took him exactly 18 shots to finish a fifth of scotch -- a shot per hole. While there is a coincidence between 18 wee drams and 18 holes, oddly enough, the modern 18 hole golf course really did originate with the Royal and Ancient course. St. Andrews originally had 11 holes, but as two were considered too short they were eliminated and play on the course became 2 rounds of 9 holes, today's modern 18.