I couldn't quickly find any old threads on out of control sports parents to add this to, so I'm offering a new one.
In suburban Chicago this week, at a youth wrestling tournament, an 11 year old was getting to close to pinning his opponent when the oppenent's father dashed from the stands, grabbed the wrestler, and tossed him through the air. He then headed toward the wrestler's father who was videotaping the whole event in the stands. http://www.youtube.com/watch?v=NxhEyKhNOwA
In the father's defense... http://www.youtube.com/watch?v=p0rM-LcAUJg&mode=related&search=