Rules schmules. The hurdler in the second lane from the left didn't let those little hurdles stand in his way.
According to about.com: "Runners are not disqualified for knocking a hurdle over, unless it’s done intentionally. Hurdlers can be disqualified for failing to jump a hurdle or trailing a foot or leg below the horizontal plane of the top of any hurdle while clearing the hurdle."
Woops.