Well, yesterday was unlikely, too :) (Not that I would know, but I saw an interview just before the match, where one of the German players said, "After the match, we want the world to continue to say 'Mexico has never beaten Germany!'" Well, that didn't quite work out..)

Who knows what can happen now! There's a lot of psychology going on now on both sides. The Mexican team must be flying high now, and think they can achieve anything, if they can beat the champion.
And the Germans are probably traumatised after losing that early in the process, and if they don't get their confidence back they'll continue losing..

Well, I will only get interested in this whole thing if Germany ends up in the finals ;) It's the only time when Germans are allowed to be proud to be Germans. Looks like a big IF now, though :)