Baseballs Unwritten Rules

The incident that took place in the Yankees-Athletics game a few weeks ago when A-Rod stepped on the pitchers mound was a supposed violation of an unwritten rule in baseball. I played 7 years of baseball growing up & actually never knew about this rule. I also have never seen it happen. I just never had the idea of stepping on the pitchers mound which I now view as disrespectful.

Here is a list of other unwritten rules in baseball:

http://www.baseball-almanac.com/legendary/liunwrit.shtml