Bayern Munich's loss to Villarreal could be attributed to a variety of factors such as player performance, tactics, injuries, or even just the unpredictable nature of sports. Without specific details, it's difficult to pinpoint the exact reasons for the loss.
One of Real's most humiliating moments also came against Bayern as they were thrashed 9-1 in a pre-season friendly in 1980, with the score 7-0 by half-time. But we've gone for both legs of their 2011/12 Champions League semi-final tie here, just because of how thrilling it all was.