http://www.midwestsportsfans.com/2010/09/video-mike-singletary-interview-dad-gum-yahoo-commercial/
Click on the link to find an old-school coach and his approach to football and life. If you don't give two figs about football, watch and listen to this video in the linked article with an ear towards hearing what is underneath the conversation about football. His personality and non-tolerance of BS really comes across.
On a side note, Coach Singletary is a Christian who wears a cross in a place of prominence. There have been more than a few who didn't think he would last long in San Francisco because of this.