The UFC fight with unintentional groin strikes?

Does anyone know the fight where one of the fighters threw a kick that tagged the other in the nuts. He was warned then did it again, then again after. I'm pretty sure it wasn't the St. Pierre vs Hughes fight, but it could be. It may have been middle, welter, or light. Anyone have any similar occurrence in mind? Just wondering because that was one of the first fight I've seen.