What the?

TCU came back to beat BYU? With a backup QB? I thought that game was over. With victories over Utah(defending Champs) and BYU on the Road the Frogs are headed downhill from here. I love it though-wouldn't it be great if SMU kept them from the BCS and all year long when they start arguing that they should be in a BCS Bowl-the universal response is "yeah but you lost to SMU" What a costly loss.