The ref in the South Korea-Switzerland game just allowed a goal to stand even though the linesman had (correctly) thrown up the flag for offsides. What a ridiculously unfair call -- absolutely the worst call I've seen in the entire tournament thus far. It even beats the infamous ejections in the U.S.-Italy game.

I know they always say "Play 'til the whistle," but the ref was in the wrong here, both for overruling the linesman and for allowing the goal to stand after play had effectively been stopped.