Friendly fire, or fratricide, refers to "the accidental killing of one's own forces in war." It has been estimated that between 2% and 20% of all war casualties have been the result of friendly fire -- troops with misinformation being commanded to fire on targets that are not enemies but instead are members of the same military operation. If you're interested in reading more, click here, here, or here. Arguably the most famous incident involved former pro football player, Pat